SELECTABLE ONE-WAY CLUTCH

A selectable one-way clutch (1A) includes a first plate (2) and a second plate (3), a claw (11), a selector plate (4) and an outer shell (5). The second plate is placed on the same axis (Ax) as the first plate. The second plate has a recessed portion (15). The claw is provided in the first plate and meshes with the recessed portion in a state where the claw projects from the first plate only when the second plate rotates in a predetermined direction. The selector plate is placed between the first plate and the second plate. The selector plate changes a state of claw. The outer shell covers an outer periphery (21) of the first plate. The outer periphery of the first plate and an inner periphery (20) of the outer shell have a tapered shape in which a diameter is gradually reduced toward a direction distance from the second plate.