A cable connector including a housing with an inserting hole adapted to receive a flat cable including terminals mounted on the housing that has contact parts to be electrically connected to lead wires of the flat cable. The connector includes an actuator having a main body moveable between a first position to enable insertion of the flat cable and a second position, parallel to the direction of insertion-and-extraction of the flat cable, to connect the lead wires of the flat cable to the contact parts. The actuator includes locked portions on opposite sides of the main body and the housing includes locking portions on opposite sides of the housing which are engaged with the locked portions when the actuator is in the second position. The locked portions include tip edges extending parallel to the direction of insertion-and-extraction of the flat cable when the actuator is in the second position and the locking portions include facing tip edges inclined to the direction of the insertion-and-extraction of the flat cable with the distance between facing tip edges of the locked portions being narrower at the inlet side of the inserting hole. The actuator is mounted to permit rearward shifting movement when the flat cable is not received within the inserting hole which displaces the relative alignment between locked portions and locking portions thereby permitting easier opening of the actuator for insertion of the cable while also providing a secure lock when connection is made with the flat cable.