A wire cover (30) is to be mounted on a housing (10) having wires (W) drawn out from a wire draw-out surface (12) on a rear end and including a cut portion (25) open in an outer peripheral surface and includes a tubular holding portion (31) configured to surround an outer periphery of the housing (10), and a projection (38) formed on an inner surface of the tubular holding portion (31) and configured to restrict forward separation of the housing (10) from the tubular holding portion (31) by being fit into the cut portion (25). Since a front stop wall to which a front surface of the housing (10) is to be locked need not be formed on a front end of the tubular holding portion (31), miniaturization in a front-rear direction can be realized.