A first housing (10) of a connector includes a housing main body (11) with a receiving portion (17) and a tubular member (20) surrounding the housing main body (11). A peripheral wall (22) of the tubular member (20) has a resilient lock (24) configured to deflect resiliently out when assembling the tubular member (20) and the housing main body (11) and to return resiliently to lock with the receiving portion (17) when the tubular member (20) is assembled properly with the housing main body (11). A protrusion (31) is formed on the outer periphery of the resilient locking portion (24) and is configured to interfere with a receptacle (61) while fitting the tubular member (20) into the receptacle (61) so that an improperly assembled tubular member (20) is corrected into a properly assembled state.