What Japan’s car seat laws actually require and what safety experts recommend for families on the road.

Navigating Japan’s road rules is one thing; doing it with a toddler in the back seat is another. Many parents quickly notice a gap between what the law requires and what safety experts actually recommend for car seats in Japan. From age and height rules to taxis and rental cars, this is what you need to know about car seat safety in Japan.

Car Seats In Japan 101

[

](https://cdn.savvytokyo.com/app/uploads/2026/02/pixta_95622886_M.jpg)Any child under the age of six must be secured in a child restraint system.

Under Japan’s Road Traffic Act, any child under the age of six must be secured in a child restraint system.

It’s important to note that responsibility lies entirely with the driver. This applies even if you’re just borrowing a friend’s car for a quick grocery run or catching a ride with a neighbor. If the police catch you transporting a child under six without a seat, there’s no monetary fine, but you will receive one demerit point on your license.

While a single point might feel like a “slap on the wrist,” the safety risks are anything but minor. 

When Is a Car Seat Not Legally Required?

Japan’s “Road Traffic Act Enforcement Order” does allow for a few specific exemptions:

• **Space Issues: **If the vehicle’s structure prevents installing a car seat, or if the car is already at full capacity and there isn’t space to secure multiple children.

• Health & Care: If a child has a medical condition or injury that prevents proper use, or if urgent daily care (such as changing a diaper) must be provided while the vehicle is moving. 

• Public Transport: Car seats are not required by law when riding in taxis or buses.

• Emergencies: During urgent transport to a hospital or medical facility.

Experts Recommend Using Car Seats For Longer

While the law lets you stop using a car seat the day your child turns six, the Japan Automobile Federation (JAF) recommends using the measuring tape rather than age.

In 2025, JAF updated its guidelines, raising the recommended height for child seat use from 140 cm to 150 cm. Since the average child doesn’t hit the 150 cm mark until around age 12, this means your “big kid” should likely stay in a booster seat much longer than the law requires.

The reason comes down to fit. Adult seat belts are designed for adult bodies**. **If the belt crosses a child’s neck or abdomen instead of the collarbone and hips, the risk of serious internal injury increases in a crash. In other words, meeting the legal minimum and meeting the safest standard are not always the same thing.

Choosing The Right Car Seat In Japan

[

](https://cdn.savvytokyo.com/app/uploads/2026/02/iStock-1178728214.jpg)Keep your child rear-facing.

Manufacturers categorize seats based on a mix of age, height and weight. Here’s a quick cheat sheet for your next shopping trip:

Seat TypeApprox. AgeHeight RangeInfant Seats (Rear-Facing) *“ベビーシート”*Newborn to 1 year40–85 cmChild Seats (Forward-Facing) *“前向き チャイルドシート” *15 months to 4 years76–105 cmJunior / Booster Seats *“ジュニアシート”*4 to 12 years100–150 cm

Experts recommend keeping your child rear-facing for as long as your seat’s height and weight limits allow, and using a booster until the seat belt fits your child correctly.

Where To Buy Or Rent A Car Seat In Japan

[

](https://cdn.savvytokyo.com/app/uploads/2026/02/iStock-2194119242.jpg)From rental companies to buying a car seat online, Japan has plenty of options.

Ready to shop? Thankfully, Japan has plenty of options for every budget, as well as a few rental options if you are just visiting.

In-Store Retailers

If you want to “test drive” a seat before buying, head to:

• Akachan Honpo: The ultimate destination for new parents. They have “Safety Advisors” who can help you understand the difference between seat belt–installed and ISOFIX models.

• Babies“R”Us / Toys“R”Us Japan: Great for seeing international brands like Joie, Cybex and Graco in person.

• Nishimatsuya: Their in-house brand, SmartAngel, offers some of the most budget-friendly seats in Japan without compromising on safety standards.

Online Options

For doorstep delivery, Amazon Japan and Rakuten are the best choices. Search for “チャイルドシート” (Child Seat) or “ジュニアシート” (Junior Seat). Make sure to check the seat for the E-mark (a tiny circle with an “E” inside). That symbol means the seat meets official safety standards in Japan.

Rentals Options

If you’re renting a car, you can usually add a child seat when you book. Most companies charge a one-time fee per rental rather than a daily rate.

CompanyInfant / Child SeatBooster SeatToyota Rent-a-Car¥1,650¥1,100Nippon Rent-A-Car¥1,100¥1,100Times Car Rental¥1,100¥550Orix Rent-A-Car¥1,100¥1,100

Rental Services:

If a rental car add-on isn’t an option, standalone baby gear rental companies offer a wider selection of seats, from basic boosters to premium infant models. These are some of the most widely used services in Japan:

DUSKIN “Kasite Net” – A reliable option with a large catalog of models.

Price: Approximately ¥3,500 – ¥6,600 per month for popular Combi or Leaman seats.

BabyRenta -Offers a wider selection, including premium brands such as Cybex and Joie.

Price: Short-term rentals (around three days) start at roughly ¥6,000. Monthly rentals are a better value at around ¥8,000.

NiceBaby – Well-suited for medium-term rentals.

**Price: **Two-week rentals start at about ¥2,000 for basic boosters and range up to ¥7,000 for higher-end infant seats.

Keeping your child safe on Japan’s roads doesn’t need to feel overwhelming. The law gives you a starting point but the safest choice is always the seat that fits your child properly.

Have you found Japan’s car seat rules confusing, or surprisingly flexible? Share your experience in the comments!