Abstract: A lamp socket structure consisting of an insulated housing, a cover, at least one insulated conductor, a conductive screw shell and a plurality of piercing plates wherein the portion of the insulated conductor and the piercing plates are securely disposed between the insulated housing and the cover. The insulated housing has an opening at one end for receiving the screw shell which receives the base of a lamp and the cover secures title housing and screw shell by hooks or extended flanges. Each piercing plate has a sharp portion capable of penetrating the insulation of the insulated conductor to contact the wire therein and another end forming a contact terminal for connection to the screw shell or an electrode of the lamp base.