Direct answer: Kei cars are small Japanese vehicles built to a national class that caps engine size and external dimensions. Under the current limits, a kei car has an engine under 660cc, a length of up to 3.4 m, a width of up to 1.48 m and a height under 2.0 m. The class was created in 1949 and gives owners lower tax and insurance costs in Japan.
What are kei cars?
Kei cars, or keijidōsha, are a Japanese vehicle class. They include tiny sedans, hatchbacks, microvans and light trucks, and many use yellow-and-black number plates, which is why English speakers call them yellow-plate cars. The class was set up in 1949 to make car ownership affordable and to support the domestic car industry.
Why do kei cars exist?
Japan's cities are dense, and parking space is limited. Kei cars fit narrow streets and small car parks, and their lower tax and insurance make them cheap to own. Many are also used as work vehicles, especially microvans and trucks.
What makes a kei car different?
- Small engine, under 660cc
- Short, narrow body
- Light weight, which helps economy
- Japanese-market design, often with right-hand steering
Are kei cars exported?
Most kei cars are designed for the Japanese market and are generally too small and specialised to sell profitably abroad. Some models have been exported for decades, and some export versions differ from the Japanese original in width, power or equipment.
What should you know before buying one?
Kei cars are cheap to run, but they are small and light, which affects highway stability and passenger room. Parts can be harder to find outside Japan. Check the specific model, its dimensions and its import route before you buy. See kei car regulations and engine limits and the kei car buying guide.
Related guides
- Kei car regulations and engine limits
- Kei car buying guide
- Kei trucks explained
- The complete guide to JDM cars
FAQ
What are kei cars?
Small Japanese vehicles built to a national class with engine and size limits.
Are kei cars the same as mini cars?
Not exactly. Kei is a specific Japanese class. Other countries' mini cars may follow different limits.
Are kei cars good for highways?
Many are less stable and quieter-engined than larger cars, so check the model before using one on fast roads.
Last reviewed: 2026-10-20. Author: [AUTHOR NAME AND CREDENTIAL LINE - NOT SUPPLIED].
This article makes no legal, duty or price claims. Import and registration rules vary by country. Confirm with your national registry or customs authority before you buy.
