PURPOSE: To improve the visual fields of a driver's seat and a fellow passenger's seat and improve accommodation and safety by setting the driver's seat in the front of the fellow passenger's seats and in the lateral center of a vehicle chamber.

CONSTITUTION: In the application to a sports car type four-passenger car, a driver's seat S is provided nearly in the center of the lateral direction of a vehicle chamber 2, and three fellow passenger's seats S0 are juxtaposed in the back of the driver's seat S. Hence, a satisfactory visual field in both lateral directions is ensured, and side part spaces 5 are provided on both sides of the driver's seat S, so that the safety in collision accidents from lateral sides can be improved. When a fellow passenger sits down on the fellow passenger's seat S0, the can keep his legs extended so that he can enjoy comfortable driving even when he is riding in the car for a long time.