An electrical connector comprises an insulative body and at least two fitting nails. The insulative body is provided with at least two receiving grooves. An upper edge contour of each fitting nail comprises at least one stepped contour which cooperates with an inner upper wall surface of the receiving groove so as to limit a position of the fitting nail moving toward the upper and a position of the fitting nail moving toward the front, so as to allow the fitting nail to be firmly fixed in the receiving groove of the insulative body.