PURPOSE: To simplify structure by providing a rotation member coupled to one of rotary bodies on the input side and the output side, a flange coupled to the other, and a damping part to peripherally resiliently intercouple the rotation members and a flange and damp torsional vibration generated therebetween.

CONSTITUTION: Torque inputted to a flexible plat 2 through a crank shaft 301 is transmitted to a hub flange 3 through a coil ring 22 after the passage of it through a ring member 8 and plates 13 and 14 on the input side and outputted to the main drive shaft 302 side. Bending vibration contained in torque transmitted to the ring member 8 is insulated by a flexible plate 2 and hardly transmitted to a damping part 4. A damping part 4 has a viscous resistance generating part and when torsional vibration is transmitted, a rotation member and a hub flange 3 are caused to perform reciprocating torsional operation through the damping part 4 and damp twist vibration. Thus a driven plate 2 is eliminated and structure is simplified.