To prevent burglarproof of a vehicle due to letting it left behind with an engine key, stealing of an engine key, and an illegal duplication of the engine key.

A question box of RF-ID system attached near a driver's seat is operated at the same time when releasing a parking brake, and communication with the question box and a responder which a driver or an owner hand- carries makes judgment as whether or not a person who will drive is the right driver or the owner, and the electric power for engine starting and operation continuing is shut off in the case of a illegal driver.