ONE-WAY CLUTCH

An object is to provide a one-way clutch that allows unlocking torque input to the movable retainer to be made low, thereby enabling downsizing of an external apparatus that inputs unlocking torque to the movable retainer. A one-way clutch 1 includes an inner ring 5, an outer ring 3, first rollers 19 used to transmit torque between the inner ring and the outer ring provided in an annular space A between the inner ring 5 and the outer ring 3, and fixed retaining portions 31 of a fixed retainer 27 and a movable retaining portions 37 of a movable retainer 33 that are arranged alternately. The one-way clutch 1 also includes second rollers 23 provided between the movable retaining portions 37 and the first rollers 19 adapted to transmit unlocking torque from the movable retaining portions 37 to the first rollers 19 and the inner ring 5 as the movable retaining portions 37 move in the clockwise direction.