To enable mold release even if there is an undercut part, to simplify and miniaturize the structure of a mold and to prevent the abrasion of grinding parts in the movement of a split mold.
A mold is constituted of a central mold 5a, the up and down movable molds 5b, 5c arranged on both sides of the central mold in a freely up and down movable manner, the front and rear split molds 5d, 5e opposed to the central mold and having notch parts 5d1, 5e1 having width almost equal to the length of an undercut part, a moving means moving the front and rear split molds toward the central mold when the up and down movable molds are lowered and the cover plate 6 covering the surfaces of the notch parts. The front and rear split molds are allowed to escape from the up and down movable molds toward the central mold by the notch parts to be slid to perform mold release.
HIURA SUMIO
KUDO KOICHI
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