To sufficiently supply traction oil and sufficiently make it stay at a contact part between a low speed side ring and each roller so as to significantly improve the life.

In a third housing 14, three axial expanding parts 27 expanding in the axial direction toward a second housing 2 are formed, leaving a predetermined interval of a space in the circumferential direction with respect to respective rollers 37a, ... in the low speed side ring 32. In each axial expanding part 27, two first oil ports 61 to communicate to respective rollers 37a, ... sides and the low speed ring 32 side are formed. Then, traction oil existing inside a wedge roller type transmission A is supplied in quantity into the inside diameter side of the low speed side ring 32 through the first oil ports 61, 61, ... to be stored in the contact parts (traction parts) between the low speed side ring 32 and respective rollers 37a.