An electrical connector is disclosed. The electrical connector has an insulating housing extending in a longitudinal direction and having a first insertion slot and a second insertion slot parallel to the first insertion slot, a plurality of first terminals disposed separately on an upper portion of the first insertion slot along the longitudinal direction, a plurality of second terminals disposed on the upper portion of the first insertion slot and spaced apart from the plurality of first terminals, a plurality of third terminals disposed separately on a lower portion of the first insertion slot along the longitudinal direction, a plurality of fourth terminals disposed separately on an upper portion of the second insertion slot along the longitudinal direction, and a balance structure disposed on an end of the insulating housing in the longitudinal direction.