ROTATING BODY FOR ROTATION REGULATION MECHANISM, AND ACTUATOR

Provided are a rotating body for a rotation restricting mechanism, capable of expanding the use environment of the rotation restricting mechanism for restricting rotation of a rotator by engagement of a fixed restricting member with an engaging protrusion, and an actuator including the rotation restricting mechanism having the rotating body for the rotation restricting mechanism. A rotating body 2 for a rotation restricting mechanism rotates integrally with a motor 27, and rotation thereof is restricted by engagement with an engaging pin 8. The rotating body 2 for a rotation restricting mechanism includes a plurality of radial-support parts 3 which extend in a radial direction in a radial pattern and the inner end portions of which are connected to the motor 27, a plurality of first-circumferential-connecting parts 5 connecting the inner end portions of mutually adjacent radial-support parts 3, a plurality of second-circumferential-connecting parts 6 connecting the outer end portions of mutually adjacent radial-support parts 3, and a plurality of engaging protrusions 7 provided in the outer end portions of the radial-support parts 3. The interval between the engaging protrusions 7 mutually adjacent in the circumferential direction has a distance which enables relative movement of the engaging pin 8 in the circumferential direction between the adjacent engaging protrusions 7.