An electrical connector including an insulating body, a plurality of terminals disposed in the insulating body, a first shell, and a second shell is provided. The insulating body has a front side and a rear side opposite to each other, and has a protruding portion located at the rear side. The first shell is sheathed on the insulating body to form an insertion space located at the front side. The second shell is superposed on the first shell and has a locking hole at the rear side, wherein the protruding portion is locked with the locking hole, such that the second shell is fixed to the insulating body.