CANCEL CAM STRUCTURE AND ROTARY CONNECTOR DEVICE

A cancel cam structure capable of suppressing noise of contact (hammering noise) of the cancel cam structure and a ratchet to be small, and a rotatable connector device, are provided. A cam section 12 includes an outer circumferential cam wall 13a for allowing a ratchet 20 to slide thereon; an inner wall 13b located radially inner to the outer circumferential cam wall 13a; and coupling cam walls 13c and 13d for coupling the outer circumferential cam wall 13a and the inner wall 13b. The outer circumferential cam wall 13a, the inner wall 13b, and the coupling cam walls 13c and 13d are formed parallel to an axial direction X of a steering shaft; and an enclosed space S is formed by the outer circumferential cam wall 13a, the inner wall 13b, and the coupling cam walls 13c and 13d. The cam section 12 also includes a partition wall 14 or 140 for dividing the enclosed space S.