An electrical connector includes an insulation body, a main plate, a side plate and a plurality of terminals. The insulation body has at least one aperture penetrating through an upper surface and a lower surface of the insulation body. The main plate is fastened in the insulation body. The side plate is fastened in the insulation body. The side plate is disposed to one side of the main plate. The main plate has a first corresponding side. The side plate has a second corresponding side. The second corresponding side is corresponding to the first corresponding side in the at least one aperture. The first corresponding side and the second corresponding side are exposed to an outside of the insulation body through the at least one aperture. The plurality of the terminals are mounted in the insulation body.