The purchase price is only the beginning. A standard car driven 8,000km a year costs roughly ¥500,000 to ¥700,000 annually once you count parking, fuel, automobile tax, both kinds of insurance, the shaken inspection and maintenance. Spread over twelve months that is ¥40,000 to ¥60,000, comparable to a second rent.
Parking is the item that varies most. Central Tokyo runs ¥30,000 to ¥50,000 a month, suburbs ¥10,000 to ¥20,000, and rural areas often nothing at all because the house comes with space. In the cities you also need a garage certificate (shako shomeisho) proving you have a parking space before you can register the car at all.
Shaken, the compulsory roadworthiness inspection, is due three years after a new car is registered and every two years after that. It runs ¥100,000 to ¥150,000 for a standard car and ¥60,000 to ¥100,000 for a kei car, including the weight tax and compulsory insurance bundled into the bill.