Abstract: A connector housing (1) is provided with a receiving portion (2) for receiving a connector (A) and a relatively narrow cable lead-out portion (4) extending from a shoulder portion (3) formed at the rear end thereof. A locking screw (8) for locking a connector (B) is inserted into a side face of the receiving portion (2) of the connector housing (1). When an operating portion (10b) which is arranged at the rear end of a locking piece (10) and exposed out of the outer surface of the cable lead-out portion (4) is pressed, the locking piece (10) swings against the elastic force of a tongue piece (10d), thereby releasing the engagement of a claw portion (10a) thereof with the connector (B). The tongue piece (10d) abuts against the locking screw (8), and the front end of the locking piece (10) is formed into a forked shape to avoid interference with the locking screw (8).