A clutch device comprising: a clutch including a friction member and a pressure member for pressing the friction member, the pressure member being movable to a contact start position where contact between the pressure member and the friction member is started and to an engagement position where the pressure member is pressed against the friction member and the clutch is engaged; and a drive unit adapted to move the pressure member, the drive unit including an actuator, a first rotation shaft (1S, 11S) adapted to be rotated by power of the actuator, a first member (1Ar, 11Ar) adapted to rotate together with the first rotation shaft (1S, 11S) around the first rotation shaft (1S, 11S), a second rotation shaft adapted to rotate together with the movement of the pressure member, a second member adapted to rotate together with the second rotation shaft around the second rotation shaft, and a coupling member adapted to connect, and to interlock, the first member (1Ar, 11Ar) and the second member, characterized in that the clutch is adapted so that a clutch reaction force defined as a force acting on the drive unit from the pressure member increases in a course in which the pressure member moves from one position to the other position of the contact start position and the engagement position, the first member (1Ar, 11Ar) is placed in a first position when the pressure member is placed in the one position of the contact start position and the engagement position, and placed in a second position when the pressure member is placed in the other position of the contact start position and the engagement position, and the first position and the second position are so that a lever ratio (rt) is larger when the first member (1Ar, 11Ar) is in the second position than when the first member (1Ar, 11Ar) is in the first position, wherein the lever ratio is defined as a ratio (T2/T1) of torque of the second rotation shaft to torque of the first rotation shaft (1S, 11S). a clutch including a friction member and a pressure member for pressing the friction member, the pressure member being movable to a contact start position where contact between the pressure member and the friction member is started and to an engagement position where the pressure member is pressed against the friction member and the clutch is engaged; and a drive unit adapted to move the pressure member, the drive unit including an actuator, a first rotation shaft (1S, 11S) adapted to be rotated by power of the actuator, a first member (1Ar, 11Ar) adapted to rotate together with the first rotation shaft (1S, 11S) around the first rotation shaft (1S, 11S), a second rotation shaft adapted to rotate together with the movement of the pressure member, a second member adapted to rotate together with the second rotation shaft around the second rotation shaft, and a coupling member adapted to connect, and to interlock, the first member (1Ar, 11Ar) and the second member, characterized in that the clutch is adapted so that a clutch reaction force defined as a force acting on the drive unit from the pressure member increases in a course in which the pressure member moves from one position to the other position of the contact start position and the engagement position, the first member (1Ar, 11Ar) is placed in a first position when the pressure member is placed in the one position of the contact start position and the engagement position, and placed in a second position when the pressure member is placed in the other position of the contact start position and the engagement position, and the first position and the second position are so that a lever ratio (rt) is larger when the first member (1Ar, 11Ar) is in the second position than when the first member (1Ar, 11Ar) is in the first position, wherein the lever ratio is defined as a ratio (T2/T1) of torque of the second rotation shaft to torque of the first rotation shaft (1S, 11S).