To provide a melting member and a method for wiring a wire harness to facilitate a manufacturing process and effect a rapid manufacturing process to save a labor and to easily form a module of a molded product by integrally forming the molded product and a wire harness.

A melting member 3 is provided to adhere together a molded product 1 and the wire harness 2. The melting member 3 is formed of a hot melt material, and a harness containing part 3f in which the wire harness 2 is pushed is provided and forms the melting member 3 having flexibility. Further, one 3a of the melting member 3 having the harness containing part 3f is fixed at the molded product 1, the wire harness 2 is pushed in the harness containing part 3f of the melting member 3 and thereafter, by heating and melting the melting member 3, the melting member 3 embraces the wire harness 2 and is adhered to the molded product 1, and this constitution provides a method for wiring the wire harness 2 that the wire harness 2 is mounted on the molded product 1.