Driving with a child under 6 years old without a child seat is against the law in Japan (police will accuse and charge a penalty if you are caught).
Please be sure to request a child seat beforehand if you have a child under 6 years old.
You can add on child seats as an option when you book a car.
*One child seat requires the space for one and a half adults.
Please be sure to count the space of the child seat, bigger than 1 adult when you book a car.
*Please include children 6 years old or older in the number of adult passengers.