The present invention provides a rotary sinker capable of suppressing energy loss and achieving reduction in the driving load, a knitting machine provided with the rotary sinker, and a knitting machine control apparatus. The sinker 3 comprises a rotating body 4 that can rotate about an axis, and supporting members 32, 34 which rotatably support the rotating body 4. A circumference edge portion of the rotating body 4 is provided with sinker teeth 41 formed of a plurality of projecting sections to which rotational drive force is transmitted and with which a knitting yarn can be engaged.