To reduce the number of bearings in a planetary roller type friction transmission gears and support thrust load by the planetary roller type friction transmitting device itself with certainly.

This friction transmission gear T/D has a sun roller 23, a plurality of planetary rollers 24 externally connected to the sun roller 23, a ring roller 25 internally connected by the planetary rollers 24, a casing 31 retaining the ring roller 25, a carrier 26 which rotatably supports each planetary roller 24 through a carrier pin (retaining body) 27, and an output shaft 22 connected to one end of the carrier 26. In such a device T/D, one end side of a rotational body composed of the carrier 26 and the output shaft 22 is rotatably supported by a rolling bearing 37 fitted between the casing 31 and the output shaft 22. The other end is rotatably supported by the ring roller 25 retained by the casing 31, the planetary roller 24, and the carrier pin 27. All of thrust load to be applied to the output shaft 22 is received by the rolling bearing 37.