To provide a method and an apparatus which do not generate the positional deviation or inclination of a component, or damage of the mirror surface of a moving side mirror insert when a stamper replacement unit component on which a stamper is previously mounted is placed on the upper surface of a lower side movable die plate in an optical disk molding die for vertical molding machine.

A lifting tool 25 to support a stamper replacement unit component 1 freely attachably and detachably is fitted with the guide rail 20 of two parallel sides 21 of a frame-shaped body 17 for placing the stamper replacement unit component mounted on the lower side movable die plate 2, is slid and lowered in the notched part 23 of a guide rail 20. The stamper replacement unit component 1 supported by the lifting tool 25 is placed on the lower side movable die plate 2.