An electrical connector includes: an insulating body; and a first row of terminals and a second row of terminals housed in the insulating body, each terminal in the first row of terminals having a tail portion, a contact portion, and a body portion, the first row of terminals including a signal terminal pair having a pair of signal terminals and a ground terminal arranged on one side of the signal terminal pair, wherein a first center distance between the contact portions of the signal terminal pair is different from a second center distance between the contact portion of the ground terminal and the contact portion of an adjacent signal terminal.