Driving in Japan with Kids: Child Seat Law, Choosing a Car and Planning the Trip

Driving in Japan with Kids: Child Seat Law, Choosing a Car and Planning the Trip

Most parents treat a child seat as the last box to tick when booking a rental car in Japan. When GoodCars looks at family trips, the order turns out to be the reverse: decide on the seats first, because they change how many people the car can carry, how much luggage fits and how long you can drive in a day. Book the car first and the usual result is a family at the counter who no longer fit.

This guide follows the order you actually need to decide things: what the law requires, which seat your child needs, renting versus bringing your own, how far to size up the car, and only then the itinerary. Licences, insurance and costs are covered in the GoodCars Japan car rental complete guide and are not repeated here.

In Japan, using a seat for a child under 6 is not a parenting choice (illustrative image)

The law first: under 6, and the driver is responsible

Article 71-3, paragraph 3 of Japan's Road Traffic Act says a driver must not drive with a child under 6 who is not using a child restraint. Three things follow from that:

• The duty sits with the driver, not the parent in the next seat. Whoever is at the wheel is the one in violation.
• There is no short-trip exception. Airport to hotel and car park to restaurant both count.
• Holding a child on your lap is not using a restraint. The law means a device fixed to the seat.

A violation means 1 point against the driver and no fine. That sounds light, but the penalty was never the point of the rule. Visitors on foreign licences have no Japanese licence to record points against; how repeat violations are handled is explained in the GoodCars guide to Japan traffic rules and fines.

The latest nationwide survey by the National Police Agency and JAF found 84.0% of children under 6 using a seat: 94.8% of those under 1, 86.9% of ages 1 to 4, but only 65.7% of 5-year-olds. The child most likely to go without is the one who feels nearly grown up, which is also the age when "just this once" gets said most on holiday.

The legal exceptions, and the few that matter to visitors

The Act and its enforcement order list several exceptions, but most have nothing to do with rental cars. These are the ones you may actually meet:

Turned 6, seat gone? The legal line is not the safety line

The law stops at 6, but adult seat belts are built around adult bodies. Japan's Consumer Affairs Agency advises continuing with a seat after 6 until the child's build allows a seat belt to be worn properly. The common height guide used to be 140 cm; JAF has since raised its recommendation to under 150 cm, while noting that this is only a guide and build matters too.

Check two places: the lap belt should sit on the pelvis, not the stomach, and the shoulder belt between the collarbone and breastbone, not on the neck. If either is wrong, use a booster. So a family with a 7 or 8-year-old still needs to count a seat when booking.

Three seat types: go by height, not just age

Japanese rental companies generally offer three types. The figures below are one major Japanese rental company's published guide; treat them as a reference and follow what your supplier says:

When booking, give your child's height, weight and age in months rather than just "three years old". The current UN R129 standard classifies seats by height and requires rear-facing use until 15 months; the older R44 standard goes by weight. Ranges differ between products, so follow the seat's own instructions.

The height, weight and approval details are on the seat label, so read it first at pick-up (illustrative image)

Rent or bring your own: both need a question asked first

GoodCars is an agency channel for Japanese suppliers. Whether seats are offered, which sizes, how many and at what cost are all set by the supplier on your booking, and can differ by company and pick-up point. Confirm when you book and do not assume there will be one on the day. For typical costs, see the Japan car rental price guide.

Rules published by major Japanese rental companies are a useful warning. One requires a seat to be reserved with the car when a child under 6 is travelling, and may refuse the rental if you have neither reserved one nor brought one. Another now takes seats on a request basis, so nothing is secured until the company replies. Sorting it out at the counter is a real gamble.

One extra point if you bring your own. Japanese law defines a child restraint as a device that meets Japan's vehicle standards and suits the child's stage of development. Products sold in Japan carry the orange UN "E" approval label (R44 or R129), so check yours for it. GoodCars could not find a clear official statement on seats carrying only another country's approval mark, so ask the seat manufacturer before you travel.

Choosing the car: seats eat passenger and luggage space

A 5-seater or 7-seater will not necessarily stay that way once child seats go in. One Japanese company says a child seat takes up about 1.5 adult places; another publishes an example of a compact 7-seater that carries only 6 with one child seat and only 4 with two, counting the children in those seats. The rules vary, but the direction is the same: with child seats you cannot pick a car by matching people to seats.

Three more limits are easy to miss. ISOFIX seats fit only in certain positions. Once a seat is in, the middle position may not take another. Commercial vans may not take child seats at all. And every child counts as a passenger.

Sliding doors help in tight car parks, but they are not available at every pick-up point on every date (illustrative image)

With the third row in use, boot space is often very small (illustrative image)

Count the luggage too. A full three-row vehicle often has no room behind the last row for large suitcases, and a pushchair takes space of its own. GoodCars suggests listing your suitcases, pushchair and seats, then comparing that list with the vehicles on the booking page. Equipment and the exact model depend on the supplier, so raise any specific need when booking.

See Cars for Your Family Trip

Pick-up day: ten minutes to get the seat right

A seat in the car is not the same as a seat fitted correctly. In the same national survey, 22.4% of 434 infant and toddler seats were installed wrongly, most often with a loose fixing belt, and 41.3% of 651 children were seated incorrectly, most often with a loose harness.

Bear in mind that at least one company states that the customer fits the seat and that even if staff help, the final safety check is yours. Do not drive off just because someone at the counter fitted it. Run through this list:

Allow time as well. GoodCars suggests adding 20 to 30 minutes for fitting seats, loading bags and a toilet stop, and not scheduling pick-up when the children are at their most tired or hungry. If they will be exhausted after landing, consider collecting the car the next day.

Planning the trip: measure by your child's limit, not by sights

The classic family road trip mistake is planning at adult pace. GoodCars works from three rules:

• No leg longer than your child can sit. With younger children, plan a stop roughly every 1 to 1.5 hours, and save longer legs for nap time.
• One main stop a day, plus a backup. The backup is something indoors or close to the hotel for rain or tired kids.
• Keep the first and last days short. A short drive to the hotel on pick-up day, and on return day leave the time for returning the car and checking in.

For breaks, expressway service areas (SA) with shops usually have a baby room for changing and feeding, and some have hot water. Facilities vary by site, and smaller parking areas (PA) offer less, so check your route before leaving.

Even a quick convenience store stop means everyone gets out (illustrative image)

Where to go for a first family drive

Okinawa is the usual pick: no snow, and days built around beaches and the aquarium. But Naha Airport to the Churaumi area is about 2 hours each way by expressway, so with children, avoid a day trip and spend a night further north. See the Okinawa 4-day self-drive itinerary.

Beach days mean short drives and an easy exit, which makes them simple to adjust (illustrative image)

Hokkaido in summer has space and easy roads, but long distances: New Chitose Airport to Furano takes about 2 to 2.5 hours, so GoodCars suggests at least one night there. See the Furano and Biei self-drive route. Winter snow roads are not for families new to driving in Japan. Around Tokyo, start from Narita or Chiba to avoid the city centre; the Boso Peninsula route has short legs and works well as a first try.

Hokkaido's flower fields suit families, but stick to one area per day (illustrative image)

Frequently Asked Questions

Q1. My child has turned 6. Is a seat still needed in Japan?

Not by law, though a seat belt is required. If the lap belt sits on the stomach or the shoulder belt touches the neck, keep using a booster. JAF's recommended guide is a height under 150 cm.

Q2. The hotel is only a few minutes from the airport. Do we still need it?

Yes. There is no short-trip exception for a child under 6. Taxis are exempt; rental cars are not.

Q3. Can I always get a child seat when booking through GoodCars?

Not always. GoodCars works with Japanese suppliers, and availability, sizes, numbers and fees depend on the supplier and pick-up point. Confirm when you book and give your child's height, weight and age in months.

Q4. Two children need seats. Is a 5-seater enough?

That depends on the car and the company's rules. With two seats in the rear, the middle position is rarely usable for an adult. For four or more people with large luggage, GoodCars suggests going a size up and confirming the real capacity with seats fitted.

Q5. Can the seat go in the front so I can reach my child?

It is not illegal, but it is not advised. Japan's transport ministry urges rear fitting, and a rear-facing seat should never go in front of an airbag. If your child needs attention, have an adult sit beside them in the rear.

Q6. My child cries as soon as we set off. Can I hold them for a bit?

No. Crying is not an exception, and your arms will not protect a child in a crash. Stop somewhere safe, settle them and set off again. Stop for feeds and changes too.

Q7. What documents do we need to drive in Japan with kids?

Children only need their passports. The driver's documents depend on where the licence was issued. Most visitors need a 1949 Geneva Convention International Driving Permit plus their home licence and passport; Vienna Convention permits are not valid in Japan. Licences from Switzerland, Germany, France, Belgium, Monaco and Taiwan use an official Japanese translation instead of an IDP. Licences from mainland China and Indonesia cannot be used. Details are in the GoodCars complete guide.

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