PURPOSE: To provide information by reading an ID tag anywhere at necessary time by preventing the IC tag, serving as an information memory medium, from interfering with work of building a vehicle, and further discriminating car type information without a particular additional member or the like even after shipping the vehicle.

CONSTITUTION: An ID tag 10 serving as an information memory medium, in which car type information of specification model, standard, etc., is stored, is sealed in a car body part of fuel lid 11 or the like and used partly as this car body part, and at the time of vehicle production in a production line and after shipping a vehicle, by reading the car type information, stored in the ID tag 10, by a contactless read device comprising a microwave communication antenna 17, controller 16, etc., the car type information can be discriminated.