A connector is such that a first housing (10) is provided with a slider (21) formed with two cam grooves (24), a second housing (30) is formed with two cam followers (36) and contact edges (27) are formed at entrances (24E) of the cam grooves (24). An outer peripheral surface of the cam follower (36) has a substantially semicircular surface (41) on a rear side in an entering direction into the cam groove (24). A receiving surface (44) extending in the same direction as the entering direction into the cam groove (24) from an end part of the substantially semicircular surface (41) facing the contact edge part (27) is formed on the outer peripheral surface of the cam follower (36), and at a right angle or at an angle α smaller than a right angle to a sliding direction of the slider (21).