Connecting member for a sports boot closure and tightening device (4), comprising a base (25, 35) adapted to be fixed on the surface of the sports boot and a connecting element (31, 37) adapted for cooperation with a second connecting member, wherein the connecting element (31, 37) has a geometry such that its tangent (c, d; c′) to the zone where it connects with a second connecting element of the second connecting member is not perpendicular to the closure direction of the connecting member in the configuration in which it closes and tightens the sports boot.