An injection mold for molding a product including an insert element, which includes a plurality of terminals each having a contacting portion, includes a male mold and a female mold movably engaged with the male mold. The male mold includes a male platen for fixing a fastening element therein. The fastening element defines a plurality of fastening grooves for fastening the contacting portions in a first male groove opened on the male platen. The male mold further includes a supporting element cooperating with the male platen to fixing a locating mold core in the male platen. A top end of the locating mold core projects into the first male groove and further defines a locating groove for fastening one contacting portion adjacent to a male sprue which is opened on the male platen and connected with the first male groove via a second male groove of the male platen.