To solve problems that in a structure in which a sun roller and an outer ring are brought in contact with the same perpendicular line of a cone generatrix, a normal force having the same magnitude is applied to an input side and an output side of a double cone, so that an output torque ratio has limitations, thereby a torque does not increase or adversely decrease along with deceleration, and no stable normal force can be obtained, and to make it possible to very significantly widen a speed change range, and arbitrarily set the normal force.

A friction type transmission includes the double cone having an input shaft and an output shaft rotatably supported in a casing, and slidably supported on a support shaft of a carrier provided coaxial with the input and output shaft, an input ring provided coaxial with the input and output shaft and rotationally driven by the input shaft in which the outer peripheral surface is made to be brought in contact with the double cone, and the output ring in which the inner peripheral surface is made to be brought in contact with the double cone. The friction type transmission also includes a plurality of input double cones brought in contact with the input ring and a plurality of output double cones brought in contact with the output ring in the carrier in the circumferential direction respectively. An intermediate ring having a contact point of the input double cone and the output double cone is arranged on the conical surface rectangular to each cone generatrix of the input double cone and the output double cone passing through the contact points.