A clutch disc forming coil receiving notches integrally interconnected with inner peripheral edges of notched portions, the coil receiving notches being further fitted therein with coil springs, and window holes engaging with the coil springs being provided on side plates. Window holes are arranged on a circumference of a hub flange with spaces provided therebetween, resiliently deformable coil springs are fitted in the window holes in the circumferential direction, notched portions having a prescribed length in the circumferential direction are formed at central portions between window holes on an outer peripheral edge thereof. Stop pins on the plates are adapted to engage with the notched portions with prescribed plays left therebetween in the circumferential direction.