PURPOSE: To largely improve productivity and functionality by integrally molding a flexible wiring board and a reinforcing unit by injection molding.

CONSTITUTION: A flexible wiring board 1 is formed by forming a conductor circuit 3 on one side face of a flexible base substrate 2, and forming an insulating layer 4 of a coverage material except a terminal, a land thereon. A plurality of fine through holes 5 are formed at the substrate 2 except that formed with the circuit 3 of the board 1. Such a board 1 is set in an injection metal mold, a reinforcing unit 6 is formed by injection molding an engineering plastic melted at a high temperature at the position required to reinforce the substrate 2, part is press-fitted to the hole 5 of the substrate 2, and a rivet-like state 5a is formed at opposite side. Thus, an assembly to an electronic equipment is facilitated, and, in some cases, can be integrated with a case of the equipment.