To prevent dropping of a power roller in assembling.

Stepped parts 47, 48 are formed on a power roller accommodating part 4A for regulating the displacement of a cage 196 toward the axial direction of input and output discs, a cylindrical part 99 projecting toward a trunnion 4 side is formed on a back face of an outer ring 94, on the other hand, a through hole 198 for inserting or fitting an end part of the cylindrical part is formed on the cage 196, and a stepped part 99B locked on the cage 196 of a peripheral edge of the through hole 198 in displacement toward the axial direction of the input and output discs, is formed on an end part of the cylindrical part 99.