A reverse input cutoff clutch (1, 1a), comprising: a pressed member having a pressed surface around an inner peripheral surface thereof, the pressed member being fixed to another member so as not to rotate; an input member having an input-side engaging portion arranged on an inner side in a radial direction of the pressed surface, the input member being coaxially arranged with the pressed surface; an output member having an output-side engaging portion on the inner side in the radial direction of the pressed surface arranged further on the inner side in the radial direction than the input-side engaging portion, the output member being coaxially arranged with the pressed surface; and an engaging element (5, 5a-c) having a main engaging element body (30, 30a-c) and a link member, the engaging element (5, 5a-c) being arranged on the inner side in the radial direction of the pressed surface so as to be able to move in a first direction as a direction away from or toward the pressed surface; characterized in that the main engaging element body (30, 30a-c) comprises a pressing surface (32, 32a, 32b) facing the pressed surface, a pivot-supporting portion located on a side nearer to the pressed surface than the input-side engaging portion in the first direction, and an output-side engaged portion (34, 34a) engaging with the output-side engaging portion; the link member comprises a first end portion pivotally linked to the pivot-supporting portion, and a second end portion pivotally linked to the input-side engaging portion; and the engaging element (5, 5a-c), by the pivot-supporting portion is pulled by the input-side engaging portion through the link member when rotational torque is inputted to the input member, displacing so as to move away from the pressed surface, and by causing the output-side engaged portion (34, 34a) to engage with the output-side engaging portion, transmitting the rotational torque inputted to the input member to the output member; and when rotational torque is reversely inputted to the output member, by pressing the pressing surface (32, 32a, 32b) against the pressed surface due to engagement between the output-side engaging portion and the output-side engaged portion (34, 34a), the pressing surface (32, 32a, 32b) is caused to frictionally engage with the pressed surface. a pressed member having a pressed surface around an inner peripheral surface thereof, the pressed member being fixed to another member so as not to rotate; an input member having an input-side engaging portion arranged on an inner side in a radial direction of the pressed surface, the input member being coaxially arranged with the pressed surface; an output member having an output-side engaging portion on the inner side in the radial direction of the pressed surface arranged further on the inner side in the radial direction than the input-side engaging portion, the output member being coaxially arranged with the pressed surface; and an engaging element (5, 5a-c) having a main engaging element body (30, 30a-c) and a link member, the engaging element (5, 5a-c) being arranged on the inner side in the radial direction of the pressed surface so as to be able to move in a first direction as a direction away from or toward the pressed surface; characterized in that the main engaging element body (30, 30a-c) comprises a pressing surface (32, 32a, 32b) facing the pressed surface, a pivot-supporting portion located on a side nearer to the pressed surface than the input-side engaging portion in the first direction, and an output-side engaged portion (34, 34a) engaging with the output-side engaging portion; the link member comprises a first end portion pivotally linked to the pivot-supporting portion, and a second end portion pivotally linked to the input-side engaging portion; and the engaging element (5, 5a-c), by the pivot-supporting portion is pulled by the input-side engaging portion through the link member when rotational torque is inputted to the input member, displacing so as to move away from the pressed surface, and by causing the output-side engaged portion (34, 34a) to engage with the output-side engaging portion, transmitting the rotational torque inputted to the input member to the output member; and when rotational torque is reversely inputted to the output member, by pressing the pressing surface (32, 32a, 32b) against the pressed surface due to engagement between the output-side engaging portion and the output-side engaged portion (34, 34a), the pressing surface (32, 32a, 32b) is caused to frictionally engage with the pressed surface.