A clutch driving device (14, 114) including a driving unit for driving a clutch and a transfer mechanism configured to transfer, to the clutch, a force in a rotation direction output from the driving unit, the clutch driving device (14, 114) comprising: a friction mechanism (80, 180) configured to generate a friction force in a direction opposite to the rotation direction of rotation transferred by the transfer mechanism, wherein the transfer mechanism includes an input shaft configured to receive a force in the rotation direction output from the driving unit, an output shaft configured to output, to the clutch, a force in the rotation direction transferred from the input shaft, and a transfer element configured to transfer a force in the rotation direction from the input shaft to the output shaft, the friction mechanism (80, 180) includes a rotation body (81, 181) configured to rotate about an axis by a force in the rotation direction transferred by the transfer mechanism, a friction force generating portion (82, 182) configured to generate a friction force by contact with the rotation body (81, 181), and characterised in that a biasing portion configured to bias one of the rotation body (81, 181) or the friction force generating portion (82, 182) relative to the other in an axial direction such that the rotation body (81, 181) and the friction force generating portion (82, 182) are brought into contact with each other, the axial direction being a direction in which the axis extends, one of the input shaft, the output shaft, or the transfer element includes a rotation transfer portion (83, 183) configured to rotate together with the rotation body (81, 181) and disposed to be movable in the axial direction relative to the rotation body (81, 181), wherein the clutch device (14, 114) has a self-lock function, in which the friction mechanism (80, 180) for achieving the self-lock function and the transfer mechanism are separated from each other in order to transfer only a force in the rotation direction of the transfer mechanism to the friction mechanism (80, 180). a friction mechanism (80, 180) configured to generate a friction force in a direction opposite to the rotation direction of rotation transferred by the transfer mechanism, wherein the transfer mechanism includes an input shaft configured to receive a force in the rotation direction output from the driving unit, an output shaft configured to output, to the clutch, a force in the rotation direction transferred from the input shaft, and a transfer element configured to transfer a force in the rotation direction from the input shaft to the output shaft, the friction mechanism (80, 180) includes a rotation body (81, 181) configured to rotate about an axis by a force in the rotation direction transferred by the transfer mechanism, a friction force generating portion (82, 182) configured to generate a friction force by contact with the rotation body (81, 181), and characterised in that a biasing portion configured to bias one of the rotation body (81, 181) or the friction force generating portion (82, 182) relative to the other in an axial direction such that the rotation body (81, 181) and the friction force generating portion (82, 182) are brought into contact with each other, the axial direction being a direction in which the axis extends, one of the input shaft, the output shaft, or the transfer element includes a rotation transfer portion (83, 183) configured to rotate together with the rotation body (81, 181) and disposed to be movable in the axial direction relative to the rotation body (81, 181), wherein the clutch device (14, 114) has a self-lock function, in which the friction mechanism (80, 180) for achieving the self-lock function and the transfer mechanism are separated from each other in order to transfer only a force in the rotation direction of the transfer mechanism to the friction mechanism (80, 180).