Abstract: A connector mainly includes a plurality of terminals, each of which includes a front conductive section and a rear piercing section; a plastic housing being provided at a front part with internal terminal slots for receiving the conductive sections of the terminals therein and at an open rear part with passages for receiving the piercing sections of the terminals; and an upper cover for closing the open rear part of the plastic housing. The upper cover is closed to the open rear opening of the plastic housing to press a plurality of wires against the piercing sections located in the passages on the plastic housing, so that insulating skins of the wires are cut to allow electrical connection of conductors in the wires with the terminals without the need of soldering.