| 摘要 |
A provisional rib portion is formed in a connected manner at a predetermined portion of a cavity to correspond to a provisional rib which is formed to project from a portion, of an injection-molded product, not serving as a design surface, and resin is injected for molding to the provisional rib portion via a gate. An end portion of the design surface of the injection-molded product is set on a parting line, and the provisional rib portion is formed in a connected manner, on a cavity surface along the parting line, by being sided to an inner side from the design surface, and a part or all on the design surface side of a connecting portion at which the provisional rib portion and the cavity are connected is formed in a curved shape.
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