A lever fitting-type connector includes a first housing, a lever that has a pair of arm sections each having a cam groove, and a second housing having a pair of cam pins. Each of the cam grooves includes an inlet section, a curved section, and a guide rail section provided on an inner peripheral face of the cam groove. The inlet section has a running-on preventing portion which is formed so that the cam pin enters the inlet section without allowing the guide rail section to run on the cam pin.