metal ring 112 and ejects the molded product 138 and releases the molded product 138 from the movable side mold plate 122 note that other than the ejecting sleeve 136 there is an ejecting pin which abuts the molded product 138 and ejects the molded product 138 but description thereof will be omitted here in a case of carrying out insert molding by the metal ring 112 because there is little heat shrinkage at the metal ring 112 which is different than as is the case with resin it is difficult of the molded product 138 to bite into the movable side mold plate 122 in the state shown in fig1 in which the mold 116 is opened there are cases in which the molded product 138 remains at the fixed side mold plate 130 so called cavity removal defect therefore the mold release resistance of the molded product 138 from the movable side mold plate 122 is made to be higher than that of the fixed side mold plate 130 and the molded product 138 is made to bite into the movable side mold plate 122 however when the molded product 138 is to be released from the movable side mold plate 122 the pushing force by ejecting pins 150 see fig1 which are for causing the molded product 138 to be released becomes large by an amount corresponding to the amount by which the mold release resistance is made.