an injection molded metal mold is provided to eliminate defects such as appearance defects of molded products , functional defects of products , or the like , caused by formation of a concave portion in a surface opposite to a gate as a metal mold is used over a long period of time . an injection molding metal mold 1 in which when a melted resin is injected first from a gate into an injection cavity , the rate of resin at the gate is not less than 5 m / sec , and the distance between the gate 5 and a portion opposite to the gate is 0 . 2 mm to 2 . 0 mm . in the mold , an exchangeable gate - opposition metal mold member , in the form of an ejection pin , is buried in the portion opposite to the gate . further an injection molding method using this metal mold is provided . the forward end of an ejection pin bites into a plastic molded product so that the molded product is held ejected when the metal mold is opened . the molded product is ejected by the ejection pin provided oppositely to the injection gate and projecting into an injection cavity after molten resin is injected into the injection cavity .