A connector configured to effectively prevent an incomplete connection caused by an imperfect insertion of an object to be connected. A tip of a flexible circuit inserted into a connector main body abuts against a lock member, a press member is rotated toward one direction while the lock member is moved toward outside in the width direction of the connector main body, a protrude portion of the press member abuts against the lock member so that the rotation of the press member becomes regulated, and the press member is rotated toward one direction while the lock member is returned toward inside in the width direction of the connector main body, the press member is allowed to rotate, therefore, the press member does not rotate to the closed position while the flexible circuit is imperfectly inserted.