PURPOSE: To integrally mold a plurality of car body exterior trim materials which are contiguous to each other in the assembly onto a car body and have different molding directions in molding by using a same metal mold.

CONSTITUTION: A plurality of car body exterior trim materials (a step board 13 and a leg shield 14) which are contiguous to each other at installation on a car body and have different molding directions in molding are integrally molded so that each bendable part 15 is formed at the contiguous part of the car body exterior trim material, in the attitude having the adjusted molding direction, and both the car body exterior trim materials are set to the attitude in the assembly on the car body by bending the bendable part 25 after molding.