A roller clutch includes an outer ring, an inner ring, a roller, a first spring member, a retainer, and a protrusion portion. The roller is disposed between the inner ring and the outer ring and is movable between a transmitting position and a non-transmitting position. The retainer has a roller holding space holding the roller and a support section supporting the first spring member. The protrusion portion is configured to regulate the movement of the roller, and resist the biasing force of the first spring member at a predetermined position.