A planetary roller 41 includes a cylindrical rolling portion 41a that rolls on an outer circumferential surface of the sun shaft 21 and a pair of shafts 41b, 41b integrally formed with the cylindrical rolling portion 41a to protrude from both ends thereof in a rotation axis C41 direction to support the cylindrical rolling portion 41a at both ends via bearings 31. The bearing 31 is a tapered roller bearing or an angular bearing including an inner race 31a fit to the shaft 41b, an outer race 31b attached to a planetary carrier 61, and a rolling element 31c that rolls between these races 31a, 31b. The rolling element 31c is limited by the inner race 31a from moving inward in a radial direction and in one direction in the rotation axis direction C41 and limited by the outer race 31b from moving outward in the radial direction and in a direction, opposite the above one direction, in the rotation axis C41 direction. In a state where the bearings 31, 31 are attached to correspond to the pair of shafts 41b, 41b, a push-in member 67 is screwed to the planetary carrier 61 for sandwiching with a predetermined portion 63a of the planetary carrier 61 the pair of bearings 31, 31 in the rotation axis C41 direction to force the outer race 31b toward the inner race 31a.