To provide laminated moldings which are free from weld loss or the like and have a presentable outlook by pressing a parison to the surface of a mold from inside the parison to set the parison and a skin sheet to the specified shape and laminating the skin sheet and the parison together in one piece.

A mold 8 is clamped and after the completion of clamping the mold, a compressed air is injected into the piston head side of a cylinder 60 for moving a blow pin 61 forward/backward and further the below pin 61 is made to advance to the parison P side. Thus the blow pin 61 is made to penetrate the parison P so that the below pin 61 is set protruding through the interior 50 of the parison P. Further, a compressed air is blown into the interior 50 of the parison disposed in the mold 8 through the blow pin 61 and the parison P is expanded by blowing to set the parison P and a skin sheet S to the specified shape along a mold cavity. At the same time, the parison P and the skin sheet S are fused together in one piece and this monolithic piece is cooled inside the mold 8 to be unloaded.