A connector includes a first terminal formed with a penetrating first fastening hole, a first housing for holding the first terminal, a second terminal connectable to an external terminal and formed with a penetrating second fastening hole, a second housing including an insulating cover portion for covering the second terminal with a part of the second terminal on the side of the first terminal exposed, the second housing holding the second terminal, a conductive relay portion disposed in a part of the second housing where the second terminal is exposed, the relay portion electrically connecting the first terminal and the second terminal, and a fastening member for fastening the first terminal, the second terminal and the relay portion with the relay portion sandwiched between the first terminal and the second terminal.