To inhibit transmission of torsional vibration to a high-speed rotating machine by reducing the transmission of rotating fluctuation to a speed-up gear.

A low speed-side shaft 3 is rotatably supported on a housing 1, an outer ring 32 is mounted on one end part of the low speed-side shaft 3, and a high speed-side shaft 17 is rotatably supported in a state of being eccentric to the low speed-side shaft 3 and the outer ring 32. Two guide rollers 37a, 37b and a movable roller 38 moving in transmitting the torque are mounted between the outer ring 32 and the high speed-side shaft 17. A pulley P incorporating a one-way clutch Y is used for the low speed-side shaft 3 (input side) of a wedge roller-type transmission A.