A clutch unit comprising: a clutch including a clutch boss, a pressure member, a plurality of torque transfer members (23, 24) configured to transfer a torque by a friction force and a clutch spring configured to connect the plurality of torque transfer members (23, 24) to one another by an elastic restoring force, the clutch being switchable to an engaged state where a torque is transferred and a disengaged state where a torque is interrupted, wherein the torque transfer members (23, 24) comprise a plurality of clutch plates and a plurality of friction plates alternately arranged in an axial direction of a main shaft on which the clutch is disposed between the clutch boss and the pressure member; an actuator configured to generate an actuation driving force for actuating the clutch; a transfer member configured to transfer the actuation driving force generated by the actuator to the clutch and to receive the elastic restoring force of the clutch spring from the clutch as a clutch reaction force, wherein the transfer member is an output shaft of a transfer mechanism, the transfer mechanism including an input shaft and the output shaft, wherein the input shaft and the output shaft are disposed in parallel; and an auxiliary spring member configured to input an assist force for assisting the actuation driving force to the transfer member, characterized by a force transfer path between the output shaft and a contact portion between the clutch plates and the friction plates, wherein the force transfer path is configured such that the timing of transfer of the clutch reaction force to the output shaft and the timing of input of the assist force to the output shaft are different, so that in switching the clutch from the engaged state to the disengaged state, the assist force is input to the transfer member from the auxiliary spring member before the clutch reaction force is input to the transfer member from the clutch, and in switching the clutch from the disengaged state to the engaged state the assist force input to the transfer member from the auxiliary spring member becomes zero after the clutch reaction force input to the transfer member from the clutch becomes zero. a clutch including a clutch boss, a pressure member, a plurality of torque transfer members (23, 24) configured to transfer a torque by a friction force and a clutch spring configured to connect the plurality of torque transfer members (23, 24) to one another by an elastic restoring force, the clutch being switchable to an engaged state where a torque is transferred and a disengaged state where a torque is interrupted, wherein the torque transfer members (23, 24) comprise a plurality of clutch plates and a plurality of friction plates alternately arranged in an axial direction of a main shaft on which the clutch is disposed between the clutch boss and the pressure member; an actuator configured to generate an actuation driving force for actuating the clutch; a transfer member configured to transfer the actuation driving force generated by the actuator to the clutch and to receive the elastic restoring force of the clutch spring from the clutch as a clutch reaction force, wherein the transfer member is an output shaft of a transfer mechanism, the transfer mechanism including an input shaft and the output shaft, wherein the input shaft and the output shaft are disposed in parallel; and an auxiliary spring member configured to input an assist force for assisting the actuation driving force to the transfer member, characterized by a force transfer path between the output shaft and a contact portion between the clutch plates and the friction plates, wherein the force transfer path is configured such that the timing of transfer of the clutch reaction force to the output shaft and the timing of input of the assist force to the output shaft are different, so that in switching the clutch from the engaged state to the disengaged state, the assist force is input to the transfer member from the auxiliary spring member before the clutch reaction force is input to the transfer member from the clutch, and in switching the clutch from the disengaged state to the engaged state the assist force input to the transfer member from the auxiliary spring member becomes zero after the clutch reaction force input to the transfer member from the clutch becomes zero.