A connector configured to be connected with a cable including a drain line, comprises a plurality of ground contacts, a housing holding the ground contacts, and a ground plate connected with the ground contacts. The ground plate has a first surface and a second surface and provided with a drain connection portion. The first surface is configured so that the cable is mounted on the first surface. The second surface is a back of the first surface. The drain connection portion is configured to be connected with the drain line and being formed on the second surface.