In an injection compression molding method of the present invention, dies 11, 12 are clamped with low pressure and a melted thermoplastic resin composition 16 is filled in a cavity space 13 from a gate while moving the cavity space 13 relative to the gate 30, and then the dies 11, 12 are clamped with a high pressure substantially simultaneously with completion of the filling to compress and form the thermoplastic resin composition 16 filled in the cavity space 13. Since the thermoplastic resin composition containing a high content of thermally-conductive filler such as an electrically-conductive filler can be injected and compressed to be molded, the present invention can be applied in manufacturing molding such as a fuel cell separator and a flat antenna.