rotation transmitting cushion 10 has the two layer stacking structure of the first outer plate 1 formed of hard resin and the second outer plate 12 formed of the elastic member and the width across flat h of the bottomed hole 124 of the second outer plate 12 is made narrower than the width across flat h of the end portion 22 of the input shaft 2 thus even before the two flat surfaces 21 formed at the end portion 22 of the input shaft 2 come in contact with the inclined surfaces 118 a of the inner wall 116 of the through hole 114 of the first outer plate 11 the torque of the input shaft 2 can be transmitted to the output shaft 3 through the second outer plate 12 this improves the initial motion characteristics of torque transmission further elastic deformation of the second outer plate 12 formed of the elastic member absorbs micro vibration of the input shaft 2 in the range where the flat surfaces 21 are not in contact with any inclined surface 118 a of the facing convex surfaces 118 therefore it is possible to prevent transmission of such vibration to the output shaft 3 further after the two flat surfaces 21 formed at the end portion 22 of the input shaft 2 come in contact with some of the inclined surfaces 118 a making up the convex surfaces 118 of the inner wall 116 of the through hole 114 of the first outer plate 11 the torque of the input shaft 2 is transmitted to the output shaft 3 through the first outer plate 11 therefore elastic deformation of the second outer plate 12 accompanying rotation of the input shaft 2 can be suppressed less than a prescribed level.