An electrical connector includes an insulator body including a mating cavity formed by a top plate, a bottom plate and two lateral plates. Two surfaces of the top plate and the bottom plate facing each other have a plurality of terminal trenches. A plurality of conductive terminals are respectively arranged in the terminal trenches of the insulator body. Each of the conductive terminals has a contact portion, a welding portion and a main body portion connected to the contact portion and the welding portion. The welding portions extend out of the insulator body respectively. Each of thicknesses of the contact portions is less than each of thicknesses of the main body portions, or each of widths of the contact portions is less than each of widths of the main body portions.