A lever type connector comprises two connector housings, a lever which is rotatably attached to one housing and has cam grooves, and cam pins which are provided on another housing and guided by the cam grooves. Connecting or disconnecting is assisted by rotating the lever with the cam pins and the cam grooves. A lever position, at which the cam pins can be inserted into entry gates of the cam grooves respectively, is set as a start position, and a lever position, at which the housings are completely connected, is set as an end position. An attaching position of the lever, at which the lever can be attached to the one housing, is set outside of an ordinary rotation range from the start position to the end position. According to the lever type connector, it is possible to prevent uncoupling of the lever within the ordinary rotation range.