A seal member (50) is to be mounted on an end of a multi-core cable (40), in which a plurality of wires (41) are bundled together and covered with an outer sheath (42). The seal member (50) is to be accommodated into a rear housing (21) of a charging connector (10) and includes a rubber plug (51) and a restricting member (52) to be externally fit on the rubber plug (51). The rubber plug (51) is formed with a cable seal portion (53) that resiliently comes into close contact with the outer peripheral surface of the outer sheath (42), and the cable seal portion (53) includes a wire seal portion (54) that individually and resiliently comes into close contact with the outer peripheral surfaces of the wires.