To provide a manufacturing method of a golf club having one or more porous metallic inserts in which the inserts are joined to a metallic matrix by an impregnation method and to provide the golf club head produced by using this method.

The manufacturing method of this composite product comprises a step that the porous metallic inserts 15 are arranged to predetermined positions in a high-pressure casting mold, and after that, a step that an alloy having a lower melting point than that of the inserts is introduced into the mold and then a step that the general casting process is executed, thereby the composite product is manufactured.