Abstract: Two partings are provided, a movable core edge face where core back is performed with a mold plate being configured of multiple plates is provided within the thickness of a component edge face, and a driving unit is provided to a pushing-cut shape and a nipping shape. With a molding process, after filling of a foaming resin, the sub parting moves in the core-back direction by predetermined amount, but a punching insert block, a nipping insert block, a slant core, and an outer slider do not move in the core-back direction, and maintain in a position before core back.