Car Seats in Japan: Child Seat Law, Taxis and Rental Cars

Understand Japan's child restraint rule for children under six, how taxis are treated, and what to arrange before renting a car with a young child.

Published October 19, 2026 at 12:22 PM JST | By Tokyo Paul

Quick answer: Japan's Road Traffic Act requires a child restraint system for children under six years old riding in a car, and the driver is responsible for using it. A cabinet order lists exceptions, including taxis and buses run as passenger transport businesses, but rental cars and private cars are not exempt. Families renting a car should request the right seat when booking.

What the law says

Under Article 71-3 of Japan's Road Traffic Act, a driver must not drive with a child under six years old on board unless the child uses a child restraint system, usually called a chairudo shito (child seat). The National Police Agency publishes the rule, and the Japan Automobile Federation, known as JAF, explains that it is the driver who can be penalized under the law. Children six and older fall outside this specific rule but must wear a seatbelt like other passengers, and the National Police Agency notes that an older child whose build does not let the belt fit properly may still need a seat.

The law and its cabinet order list specific exceptions, such as a child whose injury or condition makes a seat unsuitable, a vehicle seat to which a child seat cannot be fixed, caregiving such as breastfeeding that cannot be done with the child restrained, and urgent transport for first aid. The more important aim is the child's safety, and rules can be updated, so check the current guidance from the National Police Agency or JAF before a trip.

The rule covers a child riding as a passenger in a private car, a borrowed car, or a rental car. The listed exceptions do not include short trips, so a quick drive to a nearby restaurant is treated the same as a long one.

Types of seats and how they are chosen

Child seats in Japan are commonly described in three broad groups: rear-facing infant seats for babies, toddler seats, and junior or booster seats for school-age children. Older seats were classified mainly by the child's weight, while seats approved under the newer UN R129 standard use the child's height, and many seats cover more than one stage. JAF gives a height of under about 150 cm as a rough guide for junior seat use. The label on each seat lists its exact limits.

Look for the safety approval mark on the seat. The Ministry of Land, Infrastructure, Transport and Tourism (MLIT) explains that seats meeting Japan's current safety standard carry an E-mark, and it urges buyers to check for it. Using a seat that is damaged or very old is not recommended, and safety groups generally advise against a second-hand seat whose history is unknown.

Fit also matters. A 2026 survey by the National Police Agency and JAF found that about 84 percent of young children were riding in a seat, but only about 78 percent of those seats were installed correctly, and fewer than 60 percent of children were seated correctly, for example with harness straps set too loose. Reading the seat manual and testing the installation before a trip is a simple step.

Taxis and the exception

The cabinet order under the Road Traffic Act exempts a driver of a vehicle used in a general passenger transport business, such as a licensed taxi or a bus, when the child is a passenger of that business. The reasoning often given is practical: a taxi cannot carry a seat for every size of passenger. A street-hailed taxi rarely has a child seat on board, so a child under six may legally ride without one.

That said, an exception under the law is not the same as a recommendation to skip a seat. Some taxi companies offer a child seat or a booster if requested in advance, especially for airport trips and longer rides. Calling ahead or booking through a taxi app with an option for a seat is worth trying, though availability is not guaranteed. Details are best confirmed with the company.

A baby or toddler on a parent's lap in a taxi is still safer with a carrier or seat if one can be arranged, and road safety guidance in many countries recommends a restraint for every trip. Many families who travel with a baby bring a lightweight portable seat, or choose trains and walking where possible. Japan's trains are on time and have priority seating for families.

Rental cars: what to arrange

The taxi exception does not apply to rental cars. The driver must make sure any child under six is correctly restrained from the moment the vehicle leaves the lot. Rental companies commonly offer child seats, often for an extra fee and in limited numbers, so ask about seats when you reserve the car.

When booking, state the child's age and weight and the type of seat needed. Confirm the booking in writing and check the seat at pickup, including whether the harness and belts work and whether it fits the car. If the seat does not suit the child, ask for another before driving away.

Some families bring their own seat from home, which offers certainty about fit and cleanliness, although a seat approved in another country may not carry the Japanese mark. Rental staff can advise on whether a home seat can be installed in the chosen car. Check the current rules and the rental company's policy before the trip.

Documents and driving basics

Visitors who drive in Japan need an International Driving Permit in booklet form based on the 1949 Geneva Convention, issued in the home country before departure. The Japan National Tourism Organization notes that drivers from Switzerland, Germany, France, Belgium, Monaco and Taiwan instead carry their original license with an official Japanese translation. Smartphone and card versions of the permit are not valid, and driving is allowed for up to one year from the date of arrival.

Cars drive on the left, and every passenger must wear a seatbelt. Using a phone while driving and drinking and driving are both prohibited. Roads in cities are narrow, parking can be hard to find, and expressway tolls add up quickly, so many families choose a car only for regions where public transport is limited, such as rural areas and some islands.

Rental companies may also explain insurance coverage and ask the driver to inspect the car for scratches before leaving. Include a child seat in this check, and refuel before returning the car, as most rental agreements require.

Tips for overseas parents

Think of the seat as part of the booking, in the same way as the car size or the pickup time. Send a short message with the child's age, weight and height, and ask the company to confirm the seat type in writing. Photos of the seat label are helpful if there is any question at pickup.

Families arriving by air with a baby may find it easier to pick up the car after a night of rest rather than directly from the airport, since fitting a seat while a child is tired is harder. Some travelers use a short taxi or train ride to the hotel first, then collect the car the next morning.

If grandparents or friends in Japan will drive the family, mention the seat requirement early. Many Japanese families with young children own seats and are used to installing them, and some local governments and traffic safety groups run lending programs for residents, so locals may be able to borrow one for a visit.

Alternatives and common mistakes

Many families in Japan, especially in big cities, rely on trains, buses and walking. For a visitor with a young child, this can remove the need for a seat altogether on most days. Luggage forwarding, a baby carrier and priority seating on local trains make this practical, and young children travel free or at reduced fares on many train services (check the current fare rules).

Common mistakes include assuming the taxi exception applies to a rental car, booking a seat without checking the child's weight, and arriving at the counter without a reservation for a seat. Another is installing the seat in a rush at the parking lot. Allow ten or fifteen minutes to fit and test it.

Related ideas include junior seats for older children and the practice of keeping children in the back seat. This guide shares general information and published guidance, not legal or professional advice; for a child's safety questions, talk with the rental company, a local authority, or a pediatrician.

Frequently Asked Questions

At what age can a child stop using a car seat in Japan?

The legal requirement applies to children under six years old. Children six and older fall outside the law but still need a seatbelt, and many safety organizations suggest a booster until the belt fits properly. Check the current rules and the seat label for height and weight limits.

Do taxis in Japan have child seats?

Most licensed taxis do not carry child seats, and taxis run as passenger transport businesses are exempt from the child seat rule under the law's cabinet order. Some companies can provide a seat if asked in advance, especially for airport trips. Availability is not guaranteed, so a portable seat from home or public transport may be an easier choice.

Can I bring my own car seat for a rental car?

Many families do. A home seat gives a known fit, but it may not carry the Japanese approval mark, and not every car has the same fittings. Ask the rental company before the trip, and test the installation at pickup. Rental seats can also be reserved when booking.

Want to go deeper? Tokyo Paul's book Japan With a Toddler is available on Amazon.

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More guides from Tokyo Paul: Child Fares in Japan: Trains, Attractions and Under-Six Rules, Baby Carriers in Japan: From Onbuhimo to Modern Slings and Family Travel in Japan: Fun Stops and Easy Tips for Kids.