A clutch device comprises an engine-side input hub (6) including a driver disk (10) and a cutout (70), a transmission-side output hub (46) adapted to be indirectly coupled to the engine-side input hub (6), a fastener (68) for axially fixing the transmission-side output hub (46) to a transmission shaft (60) and adapted to be accessed for actuation through the cutout (70) after the engine-side input hub is indirectly coupled to the transmission-side output hub, and a cup-shaped stopper (72) for opening and closing the cutout (70) and, in an installed state, has a guide section (108) that projects in an axial direction out of the cutout (70) and can be supported in an end-side depression (110) of an engine output shaft (5).