Clutch, motor, and power window device

This clutch is configured so that during a non-rotative driving state of a driving-side rotor, the rotation of a driven-side rotor is inhibited by a rolling element being brought into a locked state in which the rolling element is pinched between a control surface and a collar. The clutch is further configured to release the locked state of the rolling element by the driving-side rotor being rotatively driven during the locked state to thereby cause the driving-side rotor to pressurize the rolling element in the rotating direction through a pair of circumferential holding parts. Each of a pairof circumferential holding parts includes a guiding part configured to guide the rolling element to the radially inner side of the collar upon release of the locked state. 种离合器，构成为：在驱动侧旋转体的非旋转驱动状态下，滚动体处于被夹持在控制面与轴套之间的锁定状态，从而阻止从动侧旋转体的旋转。离合器构成为：通过在锁定状态下驱动侧旋转体被旋转驱动，从而驱动侧旋转体介由对圆周方向保持部将滚动体向旋转方向按压而将滚动体的锁定状态解除。对圆周方向保持部分别包括引导部，该引导部构成为：在锁定状态解除时将滚动体朝向轴套的径向内侧引导。