An electrical connector includes an insulating housing, a dielectric body, a plurality of conductive terminals and a metallic piece. The insulating housing has a top wall, a bottom wall, a rear wall and two opposite side walls which together define an accommodating space thereamong. Two sides of a bottom of the top wall define two receiving grooves. The dielectric body has a base portion fastened in the rear wall, and a tongue portion penetrating forward through the rear wall to be inserted in the accommodating space. The conductive terminals are disposed in the dielectric body. The metallic piece has a base plate molded in the top wall. Two sides of the base plate respectively define an opening corresponding to the receiving groove. A front side of the opening is slantwise bent upward to form a clipping portion located in the receiving groove.