A clutch device for transmitting rotary drive force of a drive shaft to a driven shaft or blocking transmission, comprising: a center clutch holding a clutch plate arranged facing a friction plate to be rotatably driven by rotary drive of the drive shaft and coupled to the driven shaft; and a pressure clutch arranged facing the center clutch in a state in which the pressure clutch is able to approach or separate from the center clutch and is rotatable relative to the center clutch and elastically pressing the friction plate or the clutch plate , wherein the pressure clutch has each of a pressure-side assist cam surface and a pressure-side slipper cam surface as inclined surfaces projecting in an axial direction, the center clutch has each of a center-side assist cam surface as an inclined surface configured, for causing the pressure-side assist cam surface to approach the center clutch , such that the center-side assist cam surface and the pressure-side assist cam surface slide on each other to increase approaching force upon the approaching and a center-side slipper cam surface as an inclined surface configured, for separating the pressure-side slipper cam surface , such that the center-side slipper cam surface and the pressure-side slipper cam surface slide on each other to increase separation force upon the separation, and characterized in that an assist contact surface (Fa) as a contact surface between the center-side assist cam surface and the pressure-side assist cam surface and a slipper contact surface (Fs) as a contact surface between the center-side slipper cam surface and the pressure-side slipper cam surface are formed at different positions in a radial direction of the center clutch . a center clutch holding a clutch plate arranged facing a friction plate to be rotatably driven by rotary drive of the drive shaft and coupled to the driven shaft; and a pressure clutch arranged facing the center clutch in a state in which the pressure clutch is able to approach or separate from the center clutch and is rotatable relative to the center clutch and elastically pressing the friction plate or the clutch plate , wherein the pressure clutch has each of a pressure-side assist cam surface and a pressure-side slipper cam surface as inclined surfaces projecting in an axial direction, the center clutch has each of a center-side assist cam surface as an inclined surface configured, for causing the pressure-side assist cam surface to approach the center clutch , such that the center-side assist cam surface and the pressure-side assist cam surface slide on each other to increase approaching force upon the approaching and a center-side slipper cam surface as an inclined surface configured, for separating the pressure-side slipper cam surface , such that the center-side slipper cam surface and the pressure-side slipper cam surface slide on each other to increase separation force upon the separation, and characterized in that an assist contact surface (Fa) as a contact surface between the center-side assist cam surface and the pressure-side assist cam surface and a slipper contact surface (Fs) as a contact surface between the center-side slipper cam surface and the pressure-side slipper cam surface are formed at different positions in a radial direction of the center clutch . <EOS>