A lever connector is provided where fitting of a connector holder is reliably performed by rotation of a lever, so that workability is excellent. In a connector holder 2, a provisionally-retaining claw 17 is provided to be elastically held by a first retaining portion 14 at a predetermined rotating position in order to restrict rotation of the lever 5. In a receptacle connector 3, a pressing projection 23 is provided to move the provisionally-retaining claw 17 to a retracted position where the provisionally-retaining claw 17 is not held by the lever 5 in a state that the connector holder 2 is at a standby position, so that restriction of rotation of the lever 5 is cancelled. On the other hand, an abutting surface of the first retaining position 14 of the lever 5 is of a mountain-like shape including a restricting surface 19 and a guiding surface 20.