PURPOSE: To obtain a stripping apparatus applicable to even small-size moldings and capable of shortening molding cycle by a method wherein a core to form the inside cylindrical shape of a molding is made up of two blocks.

CONSTITUTION: After an injection molding, molds are opened to open up a splitting face Y, a conical block 20 and a mobile block 38 are moved with a movable mold 6, and the first block 24 is put between both inclined faces 30 and 36 and moved toward the inside center of a cap 8. Then, a splitting face X is opened, movable molds 4 and 6 are moved in relation to a fixed mold 2, and a rammer 50 and an ejector pin 22 are projected. The second block 26 is guided to the inclined face 44, moves toward the inside center of the cap 8 while sliding, and is separated from the inside screw 14 and an undercut section 16 in the cap 8.