One of the most useful money-saving rules for families traveling Japan by train is that children ages 0–5 can often ride JR trains for free.
However, “free” does not mean that every child under 6 automatically receives their own seat. The rules depend on the child’s age, how many young children are traveling with each fare-paying passenger and whether the child needs a reserved seat.
Quick Answer: Do Kids Ages 0–5 Ride JR Trains Free?
Usually, yes. Babies under 1 and young children ages 1–5 generally travel free on JR trains when accompanied by a fare-paying adult or child.
For children ages 1–5, each fare-paying passenger can generally accompany up to two young children free of charge. A child ticket is normally required for the third and each additional young child.
The most important exception: If a child under 6 needs their own reserved seat on a Shinkansen, Limited Express or other reserved-seat service, you generally need to purchase the appropriate child ticket for that journey.
JR Rules for Ages 0–5 at a Glance
| Age | JR Category | Typical Rule |
|---|---|---|
| Under 1 | Baby | Generally travels free when accompanied. |
| Ages 1–5 | Young child | Generally travels free when accompanied, subject to the two-young-children rule. |
| Under 6 with own reserved seat | Baby / young child | Appropriate child ticket is generally required. |
| Third young child age 1–5 with one paying passenger | Young child | Child fare is generally required. |
| Young child traveling alone | Young child | Child fare is required. |
What Does “Free” Actually Include?
When a child under 6 qualifies for free travel, they can accompany you on the eligible JR journey without purchasing their own basic train ticket.
This works particularly well on local trains and other services where you are not reserving a separate seat specifically for the child.
A Child Ages 0–5 Can Usually Ride Free When:
✓ They are traveling with a fare-paying adult or child
✓ They do not require their own reserved seat
✓ They fall within the applicable accompanied-child rules
✓ For ages 1–5, there are no more than two free young children for each fare-paying passenger
When Does “Free” Stop Being Free?
You Generally Need a Child Ticket When:
✓ Your child occupies their own reserved seat
✓ A child ages 1–5 is the third or subsequent young child accompanying one fare-paying passenger
✓ A young child travels without an accompanying fare-paying passenger
✓ The child uses certain separately ticketed accommodation or services
Common misunderstanding: You do not normally need to buy an under-6 child a JR Pass just because you want them to have their own Shinkansen seat. Instead, you generally purchase the appropriate child ticket for that particular journey.
What Happens When the Child Turns 6?
For most international trip planning, children ages 6–11 fall into JR’s child-fare category and generally pay about half the corresponding adult standard fare.
JR’s formal rules also take school status into account at the age boundaries. For example, a 6-year-old who has not yet entered elementary school may still be treated as a young child.
If your child is exactly 6: Check their applicable fare category when purchasing tickets rather than relying on age alone.
Why This Rule Can Save Families a Lot
Families with preschool-age children can save a meaningful amount on train travel, particularly if the children are comfortable traveling without separate reserved seats.
But cost is not the only consideration. On a long Shinkansen journey, purchasing a child ticket for a separate seat may still be worth it for comfort.
Our advice: Use the free-child rule where it makes sense, but do not sacrifice comfort just to avoid buying a ticket. A separate seat for a 4- or 5-year-old on a long Shinkansen journey can make the trip much easier for everyone.
The “Two Kids Free” Rule Explained
One of the most useful JR family fare rules is that each fare-paying adult or child can generally accompany up to two young children ages 1–5 free of charge.
If one fare-paying passenger is traveling with three or more young children, the third and each additional child generally needs a child ticket.
Simple formula: One fare-paying passenger = up to two children ages 1–5 traveling free, provided they do not require their own reserved seats.
Family Examples
| Family | Typical JR Fare Requirement |
|---|---|
| 1 adult + 1 child age 4 | The 4-year-old can generally travel free without their own reserved seat. |
| 1 adult + children ages 2 and 5 | Both young children can generally travel free without separate reserved seats. |
| 1 adult + children ages 1, 3 and 5 | Two can travel free; a child ticket is generally required for the third young child. |
| 2 adults + children ages 1, 3 and 5 | All three can generally travel free because the two adults can accompany up to four young children in total. |
| 1 adult + one 7-year-old + two children ages 2 and 4 | The adult and 7-year-old are both fare-paying passengers, so the two younger children can generally travel free. |
| 2 adults + four children ages 1–5 | All four can generally travel free without separate reserved seats. |
| 2 adults + five children ages 1–5 | Four can generally travel free; a child ticket is normally required for the fifth young child. |
A Fare-Paying Child Can Also Accompany Young Children
This is an easy part of the rule to miss.
JR’s rule refers to a young child being accompanied by an adult or child passenger who has paid the applicable fare.
This means a fare-paying child in the 6–11 category can also count as an accompanying passenger when applying the two-young-children rule.
Example: If one parent is traveling with a fare-paying 8-year-old plus two preschool children, both preschool children can generally travel free under the accompanied-child rule.
Babies Under 1 Are Slightly Different
JR places babies under age 1 in a separate baby category.
Babies are generally free when accompanied. However, if a baby uses their own reserved seat, an appropriate child ticket is generally required.
Important: The well-known “two kids free” limit specifically concerns the young-child category. Do not assume every part of the rule applies identically to babies under 1.
Reserved Seats Change the Rule
The free-child rule is easiest to understand on local trains and other journeys where no separate seat is being reserved for the child.
On a reserved-seat train, a young child who occupies their own reserved seat generally needs the appropriate child ticket.
| Example | Typical Result |
|---|---|
| Parent + 4-year-old sharing the parent’s seating space | Child can generally travel free. |
| Parent + 4-year-old with a separate reserved Shinkansen seat | Child ticket is generally required. |
| Parents + two preschool children, neither with separate reserved seats | Both can generally travel free. |
| Parents + two preschool children, both with their own reserved seats | Appropriate child tickets are generally required for those reserved seats. |
The key distinction: A child can qualify for free transportation without automatically qualifying for a free reserved seat.
What About Non-Reserved Shinkansen Cars?
On a Shinkansen service that has non-reserved seating, an eligible young child traveling free may sit in an available non-reserved seat when space is available.
Unlike a reserved seat, however, that seat is not guaranteed specifically for the child.
Important: If the non-reserved car becomes crowded, be prepared for the young child to share your seating space rather than expecting a separate seat to remain available.
Real-World Example: Family of Four
2 Adults + Children Ages 8 and 4
Adult 1: Adult fare or adult JR Pass
Adult 2: Adult fare or adult JR Pass
8-year-old: Child fare or child JR Pass
4-year-old: Can generally travel free without their own reserved seat
If the family wants four guaranteed reserved Shinkansen seats together, purchase an appropriate child ticket for the 4-year-old as well.
This is the decision many families actually face: The question is often not “Can my preschooler ride free?” but rather “Is saving the child fare worth giving up a guaranteed separate seat?”
Reserved vs Non-Reserved Shinkansen Seats for Kids Ages 0–5
The most important seat rule for preschool-age children is simple:
If a child under 6 needs their own reserved seat, you generally need to buy the appropriate child ticket for that seat.
If the child is traveling free under JR’s accompanied-child rules, they do not automatically receive a guaranteed reserved seat of their own.
Reserved vs Non-Reserved Seating
| Situation | Child Ages 0–5 |
|---|---|
| Reserved seat specifically assigned to the child | An appropriate child ticket is generally required. |
| Traveling free with parent in a reserved car | The child does not have their own guaranteed seat and should share the accompanying passenger’s seating space. |
| Non-reserved car with empty seats | An eligible young child may generally sit in an available seat while space remains. |
| Non-reserved car becomes crowded | The child does not have a guaranteed separate seat, so be prepared to share your seating space. |
| All-reserved-seat train | Purchase a child ticket if you want the child to have their own assigned seat. |
Key difference: An empty non-reserved seat may be available for your child, but it is not guaranteed. A reserved seat belongs specifically to the passenger whose ticket assigns that seat.
When Is a Free Seat Option Practical?
Traveling without purchasing a separate child seat can work very well for shorter journeys, particularly with babies and toddlers.
Free Travel May Be Practical When:
✓ Your child is a baby or small toddler
✓ The journey is relatively short
✓ You are comfortable holding the child or sharing your seating space
✓ You are using a train with non-reserved seating and do not need a guaranteed seat for the child
✓ You are traveling outside a busy holiday period
When Is Paying for a Child Seat Worth It?
For a longer Shinkansen journey, comfort can become more important than maximizing the free-child rule.
Consider Buying a Child Ticket If:
✓ Your child is 4 or 5 years old
✓ The journey lasts two or three hours
✓ Your child is likely to sleep during the journey
✓ You are traveling with snacks, toys and several carry-on bags
✓ You want the whole family to have guaranteed seats together
✓ You are traveling during Golden Week, Obon, New Year or another busy period
Our view: For a 4- or 5-year-old on a long Tokyo–Kyoto or similar Shinkansen journey, paying for a separate child seat can be money well spent.
Example: Tokyo to Kyoto With a 4-Year-Old
| Option | What It Means |
|---|---|
| Travel free | The 4-year-old travels under the accompanied-child rule but does not have their own guaranteed reserved seat. |
| Buy a child reserved-seat ticket | The 4-year-old receives their own assigned seat for the journey. |
The first option saves money. The second gives the family more space and certainty.
Think beyond the ticket price: Two or three hours with a preschooler on your lap can feel very different from a 20-minute local train ride.
What About All-Reserved Shinkansen Services?
Some Shinkansen services do not have ordinary non-reserved cars.
Examples include several services on the JR East network where all seats are reserved.
An under-6 child can still accompany you under the applicable free-child rules, but free travel does not create an additional assigned seat for them.
If everyone needs their own seat: Purchase the appropriate child ticket for the preschool-age child when using an all-reserved service.
Do You Need to Buy the Child Seat for Every Journey?
No.
You can decide journey by journey.
A family might let a 4-year-old travel free on a short local train but purchase a child reserved-seat ticket for a three-hour Shinkansen journey later in the same trip.
Flexible approach: You do not need an all-or-nothing strategy. Use free travel where it is comfortable and buy a separate seat where the extra space is valuable.
JR Pass Rules for Kids Ages 0–5
Families sometimes assume they need to buy a child Japan Rail Pass for a preschool-age child who wants their own Shinkansen seat.
That is generally not how the nationwide JR Pass works.
Important: The nationwide Japan Rail Pass child category is for children ages 6–11. There is not a separate JR Pass price category for children ages 0–5.
So What Do You Do With a Child Under 6?
| Situation | What You Generally Do |
|---|---|
| Child under 6 travels free without their own reserved seat | No separate JR Pass is generally needed, subject to the accompanied-child rules. |
| Child under 6 needs their own reserved seat | Purchase the appropriate child ticket for that particular journey. |
| Child age 6–11 | They can purchase the child version of the nationwide JR Pass if eligible. |
| Child age 12+ | Adult JR Pass pricing generally applies. |
Common misunderstanding: You do not normally buy an under-6 child a JR Pass simply because you want them to have their own seat for one or two long Shinkansen journeys.
Example: Parents Have JR Passes + One 4-Year-Old
Option 1: Child Travels Free
Both parents use their JR Passes.
The 4-year-old travels under the normal accompanied-child rules without their own guaranteed reserved seat.
Option 2: Child Gets Their Own Reserved Seat
Both parents still use their JR Passes.
For the 4-year-old, purchase the appropriate child ticket for the specific train journey so the child can have their own assigned seat.
This gives families flexibility: You might let a preschooler travel free on short journeys but purchase their own seat for Tokyo → Kyoto or another long Shinkansen trip.
Do You Need to Buy Child Tickets for the Entire Trip?
No.
You can decide separately for each journey whether your child will travel free or whether the comfort of a guaranteed seat justifies purchasing a child ticket.
Family strategy: Consider paying for separate seats on your longest journeys while using the free-child rule on local trains and shorter trips.
What About Green Car Seats for Kids Ages 0–5?
Green Cars are JR’s premium seating class and generally provide wider seats, more legroom and fewer passengers per car.
The rules become more important when a preschool-age child will occupy their own Green Car seat.
Key point: Free accompanied travel does not automatically give an under-6 child their own reserved Green Car seat.
Reserved Green Cars on Shinkansen & Limited Express Trains
If a baby or young child occupies their own reserved Green Car seat, the appropriate child fare and ticket charges are generally required.
Unlike many standard child fares, Green Car charges generally do not receive the usual 50% child discount.
| Charge | Typical Child Treatment |
|---|---|
| Basic fare | Child fare generally applies when a ticket is required. |
| Shinkansen / Limited Express charge | Child pricing generally applies to the applicable standard charge. |
| Green Car charge | Generally the same Green Car charge as for an adult. |
Budget tip: A separate Green Car seat for a preschooler can therefore cost considerably more than an Ordinary reserved seat. Check the actual fare before deciding whether the extra space is worthwhile.
What If the Parents Have Green JR Passes?
A parent’s Green JR Pass covers that pass holder according to the JR Pass conditions.
It does not automatically create a separate Green Car seat for a child under 6.
If you want the preschool-age child to have their own reserved Green Car seat, arrange the appropriate separate child ticket and Green Car charges for that journey.
Practical advice: If you are using Green JR Passes and want a separate seat for a child under 6, ask at a JR ticket office or through the applicable reservation channel so the correct combination of tickets can be issued.
Ordinary-Class Seats Are Often the Easier Choice
Ordinary Shinkansen seats are already comfortable and spacious compared with many forms of transportation.
For many families, purchasing an Ordinary child reserved seat for a preschooler provides the extra space they need without paying the additional Green Car charge.
Our recommendation: If your main goal is simply to give a 4- or 5-year-old their own seat, start by considering an Ordinary reserved seat. Green Car is better viewed as an optional comfort upgrade for the whole family.
A Note About Local-Train Green Cars
JR East also operates Green Cars on some ordinary and rapid commuter trains.
These have different rules from reserved Green Cars on Shinkansen and Limited Express services. JR East currently allows an accompanied preschool-age child to use an available ordinary-train Green Car seat without purchasing a separate Green ticket, although during crowded periods staff may ask the child to sit on the accompanying passenger’s lap so another passenger can use the seat.
Do not mix the two rules: A local-train Green Car and a reserved Green Car seat on a Shinkansen or Limited Express are not the same ticketing situation.
What About GranClass, Sleeper Berths & Other Premium Seats?
Premium accommodation such as GranClass, sleeper berths, private compartments and special trains can have additional fare and seating rules.
Do not assume that the ordinary under-6 free-travel rule gives a child their own premium seat or berth.
Best practice: For premium or unusual accommodation, check the specific train’s rules when booking. The simple free-child rule is most useful for ordinary train travel and should not be applied automatically to every premium service.
Practical Family Scenarios: What Tickets Do You Actually Need?
JR’s child-fare rules can sound complicated when you read them individually.
In practice, most families fall into a few common situations. The examples below show how the rules generally work for ordinary JR travel.
Remember: Free travel for a child under 6 does not automatically include their own reserved seat. Whenever you want a guaranteed separate seat, the ticket requirements can change.
Scenario 1: Two Adults + One Baby
Family
2 adults + baby under 1
Typical Ticket Setup
Adult 1: Adult ticket or eligible JR Pass
Adult 2: Adult ticket or eligible JR Pass
Baby: Generally travels free when accompanied and not occupying their own reserved seat
For most families with a baby, this is straightforward. The baby can normally travel with the parents without a separate ticket.
If you want a separate reserved seat for the baby: Purchase the appropriate child ticket for that seat.
Scenario 2: Two Adults + One 4-Year-Old
Option A: Child Travels Free
Adults: Two adult tickets or eligible JR Passes
4-year-old: Generally travels free without their own guaranteed reserved seat
Option B: Give the Child Their Own Shinkansen Seat
Adults: Two adult tickets or eligible JR Passes
4-year-old: Appropriate child ticket for the journey
Which would we choose? For a short journey, free travel may be perfectly comfortable. For a long Shinkansen trip, a separate seat for a 4-year-old can be well worth the additional cost.
Scenario 3: Two Adults + Children Ages 2 and 5
If Neither Child Needs a Reserved Seat
Both children can generally travel free under the accompanied-young-child rule.
One fare-paying passenger can accompany up to two children ages 1–5 free, so this family is comfortably within the limit.
For a long journey: You could still choose to purchase a separate child ticket for the 5-year-old while allowing the younger child to travel free.
Scenario 4: One Adult + Three Preschool Children
Family
1 adult + children ages 2, 4 and 5
Typical Ticket Setup
Adult: Adult ticket or eligible JR Pass
Two young children: Can generally travel free
Third young child: Child fare is generally required
This is where the two-child limit matters: One fare-paying passenger can generally accompany only two children ages 1–5 free of charge.
Scenario 5: Two Adults + Three Preschool Children
Family
2 adults + children ages 1, 3 and 5
Typical Ticket Setup
All three young children can generally travel free if none requires a separate reserved seat.
Because there are two fare-paying adults, the family can generally accompany up to four children ages 1–5 under the free-child rule.
Scenario 6: Two Adults + One 7-Year-Old + One 4-Year-Old
Typical Ticket Setup
Adults: Adult fares
7-year-old: Child fare
4-year-old: Can generally travel free without their own reserved seat
Because the 7-year-old is a fare-paying child passenger, they also count as an accompanying passenger under JR’s young-child rules.
Useful detail: The rule is not limited to accompanying adults. A fare-paying child can also count when determining how many young children may travel free.
Scenario 7: Parents Have JR Passes + One 4-Year-Old
For Local JR Travel
The parents use their JR Passes.
The 4-year-old can generally travel free under the normal accompanied-child rules.
For a Reserved Shinkansen Journey
The parents use their JR Passes and reserve their own covered seats.
If the 4-year-old will travel without their own assigned seat, they can generally continue to travel free.
If you want the 4-year-old to have a guaranteed reserved seat, purchase the appropriate child ticket for that journey.
Important: The parents having JR Passes does not automatically provide a third reserved seat for their preschool-age child.
Scenario 8: Parents Have JR Passes + Children Ages 8 and 4
| Traveler | Typical Requirement |
|---|---|
| Parent 1 | Adult JR Pass |
| Parent 2 | Adult JR Pass |
| 8-year-old | Child JR Pass if the family is using JR Passes |
| 4-year-old | Generally free without their own reserved seat, or purchase a separate child ticket when a guaranteed seat is wanted |
Scenario 9: Everyone Wants Their Own Reserved Seat
Suppose two adults are traveling with children ages 3 and 5 and want four assigned Shinkansen seats together.
Although both preschool children could normally qualify for free accompanied travel, the family would need the appropriate child tickets for the children if both are occupying their own reserved seats.
Free-child eligibility and seat reservations are separate questions: First determine whether the child qualifies to travel free. Then decide whether you want to pay for a guaranteed seat.
Quick Family Ticket Decision Guide
| Question | If Yes |
|---|---|
| Is the child age 6–11? | Use a child fare or child JR Pass where applicable. |
| Is the child under 6? | Check the accompanied-child rules. |
| Does the under-6 child need their own reserved seat? | Purchase the appropriate child ticket for that journey. |
| Are there more than two children ages 1–5 per fare-paying passenger? | A child fare is generally required beginning with the third young child. |
| Is everyone comfortable without separate seats? | Use the free-child rule where applicable. |
The easiest way to plan: Count your fare-paying adults and children first, then count the children ages 1–5, and finally decide which preschool children need their own reserved seats.
Common Mistakes Parents Make With the Under-6 Free-Travel Rule
JR’s rules for babies and preschool-age children are generous, but the phrase “kids under 6 ride free” can lead to a few common misunderstandings.
The key is to separate three questions: Does the child qualify to travel free? Do they need their own reserved seat? How many young children are traveling with each fare-paying passenger?
| Common Mistake | Correct Approach |
|---|---|
| “Under 6 means a free reserved seat.” | Free accompanied travel does not automatically include a separate reserved seat. |
| “I need a child JR Pass for my 4-year-old.” | The nationwide child JR Pass category is for ages 6–11. For an under-6 child needing a reserved seat, purchase the appropriate child ticket for that journey. |
| “One adult can take any number of preschoolers free.” | One fare-paying adult or child can generally accompany up to two children ages 1–5 free. |
| “An empty non-reserved seat belongs to my child.” | The child may be able to use an available seat, but it is not guaranteed specifically for them. |
| “All children turn into adult fares on their 12th birthday.” | JR’s formal rules also consider Japanese elementary-school status around the 6- and 12-year boundaries. |
| “Green Car follows exactly the same child pricing.” | Green Car charges generally do not receive the standard 50% child discount. |
Mistake #1: Assuming Free Travel Means a Free Seat
This is probably the most common misunderstanding.
An eligible child under 6 may travel free with an accompanying fare-paying passenger, but that does not give the child their own assigned reserved seat.
Simple rule: If you want a guaranteed reserved seat specifically for your preschool-age child, expect to purchase the appropriate child ticket.
Mistake #2: Buying a JR Pass for an Under-6 Child
The nationwide Japan Rail Pass child category is designed for children ages 6–11.
If your 4- or 5-year-old simply needs their own seat on one long train journey, buying a child JR Pass is not the normal solution.
Better approach: Let the child travel free where appropriate, then purchase a separate child ticket only for the journeys where you want them to have their own reserved seat.
Mistake #3: Forgetting the Two-Young-Children Limit
For children ages 1–5, one fare-paying adult or child can generally accompany up to two young children free of charge.
If there are three young children with only one fare-paying passenger, the third generally requires a child fare.
Before buying tickets: Count the fare-paying passengers first, then count the children ages 1–5 traveling with them.
Mistake #4: Relying on an Empty Non-Reserved Seat
On a train with non-reserved seating, an eligible preschool-age child may be able to sit in an empty seat.
However, because that seat is not assigned to the child, you should not build your family plan around always having that extra space.
For busy trains: If having a separate seat is important, reserve one properly rather than hoping an extra seat remains empty.
Mistake #5: Applying the Rule to Every Premium Seat
Green Cars, GranClass, sleeper accommodation and other premium services can have additional fare rules.
Do not assume that the normal free-child rule automatically gives a preschooler their own premium seat or berth.
Best practice: For premium seating, confirm the specific ticket combination when you book.
Mistake #6: Focusing Only on Saving Money
Free travel is valuable, but a separate seat can sometimes be worth paying for.
A 20-minute local ride with a 5-year-old sharing your space is very different from a three-hour Shinkansen journey.
Ask Yourself:
✓ How long is the journey?
✓ How old and how large is the child?
✓ Is the train likely to be busy?
✓ Are we carrying snacks, toys or luggage?
✓ Would a guaranteed seat make the whole family more comfortable?
Mistake #7: Assuming the Age Boundary Is Always Simple
For most visitors, thinking of ages 6–11 as the standard child-fare range is a useful shortcut.
However, JR’s formal rules also take Japanese elementary-school status into account around ages 6 and 12.
If your child is right on the age boundary: Confirm the correct fare category when purchasing your tickets or pass rather than guessing.
Mistake #8: Assuming the Same Rules Apply to Every Railway Company
This guide explains JR fare rules.
Japan also has many private railways, subway systems and local transport operators, and their child-fare rules may differ.
Important: If your journey is on a non-JR railway, check that operator’s child-fare rules instead of automatically applying the JR rules described here.
The Three Questions to Remember
1. How old is the child?
2. Does the child need their own reserved seat?
3. How many children ages 1–5 are accompanying each fare-paying passenger?
If you can answer those three questions, most JR child-ticket situations become much easier to understand.
Kids Ages 0–5 on JR Trains: FAQ
Do children under 6 ride JR trains for free?
Usually, yes.
Babies under 1 and young children ages 1–5 can generally travel free when accompanied by a fare-paying adult or child, subject to JR’s accompanied-child rules.
How many children ages 1–5 can one adult take for free?
One fare-paying adult or child can generally accompany up to two children ages 1–5 free of charge.
A child fare is generally required for the third and each additional young child.
Does a baby count toward the two-child limit?
JR treats babies under 1 and young children ages 1–5 as separate fare categories.
The specific “two young children per fare-paying passenger” limit applies to the ages 1–5 category.
Does a 4- or 5-year-old need a Shinkansen ticket?
Not necessarily.
An eligible preschool-age child can generally travel free without their own reserved seat. If you want the child to have a guaranteed separate reserved seat, purchase the appropriate child ticket for that journey.
Can my child sit in an empty non-reserved Shinkansen seat?
An eligible young child may generally use an available seat in a non-reserved car while space is available.
However, that seat is not guaranteed specifically for the child, so you should be prepared to share your seating space if the train becomes crowded.
Can a child under 6 have their own reserved seat for free?
No.
If a baby or young child occupies their own reserved seat, the appropriate child ticket is generally required.
Do I need to buy a JR Pass for my 4-year-old?
Generally, no.
The nationwide Japan Rail Pass child category is for children ages 6–11. For an under-6 child who needs their own reserved seat, you would generally purchase a child ticket for that specific journey instead.
What if the parents have JR Passes?
The parents can use their JR Passes for eligible journeys while an under-6 child travels free under the normal accompanied-child rules.
If the child needs their own reserved seat, purchase the appropriate child ticket for that journey.
Can a fare-paying older child accompany preschool children for free?
Yes.
JR’s rule allows an eligible young child to be accompanied by either a fare-paying adult or a fare-paying child, so an older child with their own ticket can count as an accompanying passenger.
Can an under-6 child use Green Car for free?
Free accompanied travel does not automatically provide a separate reserved Green Car seat.
If the child occupies their own reserved Green Car seat on a Shinkansen or Limited Express train, the appropriate child fare and ticket charges apply, and Green Car charges generally do not receive the normal child discount.
What if my child is exactly 6 years old?
JR’s formal rules also consider school status around the age boundary.
A 6-year-old who has not yet entered elementary school may still fall into the young-child category, so check the applicable fare when buying tickets if your child is right on the boundary.
Do the same child rules apply to Tokyo Metro and private railways?
Not necessarily.
This guide explains JR rules. Tokyo Metro, private railways and other transport companies can have their own child-fare conditions, so check the operator for non-JR journeys.
Is it worth buying a separate seat for a 4- or 5-year-old?
For short journeys, free accompanied travel may be perfectly comfortable.
For a long Shinkansen journey, many families find that paying for a guaranteed child seat is worth it for the additional space and comfort.
Bottom line: Children ages 0–5 can often travel JR trains for free, but free travel and a free reserved seat are not the same thing. Count the young children traveling with each fare-paying passenger, then decide journey by journey whether a separate seat is worth buying.
Related Guides
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About Train Travel Japan
Train Travel Japan is written from firsthand experience traveling throughout Japan by rail. I am a Japanese native based in Canada and have traveled to all 47 prefectures of Japan over more than 30 years.
My goal is to make Japan train travel easier to understand, especially for international visitors planning JR Pass trips, regional rail journeys and independent itineraries.