To minimize the deviation between a target transmission gear ratio and an actual transmission gear ratio, which is caused by the change of transmitting moment.

A continuously variable friction transmission is provided with an input shaft and a torque shaft arranged coaxially with the input shaft and an input disc and an output disc which are both arranged so that they make a pair, and a friction roller 27 supported at roller holders 26 is arranged between these discs. Supporting of the friction roller 27 at the roller holders 26 is structured so that the friction roller can be moved in Z direction parallel to a vertical axis of the transmission but the roller cannot be moved in Y direction perpendicular to the vertical axis of the transmission.