PURPOSE: To enable a bracket to be firmly stuck on the rear surface of the base material of interior parts by a method in which the thermoplastic resin film containing ferromagnetic material is caused to intervene between the base material of interior parts of automobile and a bracket, and is melted under heating by electromagnetic induction.

CONSTITUTION: A thermoplastic resin such as polypropylene, polyethylene, polyvinyl chloride and ABS resin, etc., and the ferromagnetic powder such as stainless fiber are kneaded and extrusion-molded, and thus a film 9 is obtained. As to the mixing of thermoplastic resin and ferromagnetic powder, the ferromagnetic powder is uniformly dispersed in the thermoplastic resin at the weight ratio of e.g. 3W5:7W5. The film preferably has a thickness from 200μ or more to 1mm or less, and the ferromagnetic powder preferably has the diameter of about 10W50μ and the length of 1mm or less. The bracket 5 in which such a film is attached to fitting piece 6 is arranged on the rear surface of the base material 2 of interior parts 1 in automobile, and then is set in molds 12, 13 incorporated with an electromagnetic induction heater. High frequency current is energized into a coil 14, and the film 9 is melted, whereby the bracket 5 is caused to adhere to the rear surface of the base material 2.