To improve the life and the reliability by maintaining the lubrication condition successfully.

Traction oil is forcedly introduced from an external pump (an illustration omitted) via an oil filler port 81, and traction oil is guided from a guide passage 86 of a second housing 2 via each guide passage a, b. Then, traction oil is supplied from an axial guide passage c into contact parts (traction parts), in which the lubricating condition is apt to thin, between a high speed shaft 17 and respective rollers 37a..., while traction oil is supplied from an axial guide passaged into the contact parts (the traction parts) between a low speed ring 32 and respective rollers 37a. This enables the full forced lubrication of the traction part.