To provide the multi-speed ratio apparatus which can obtain all required vehicle performance including the start acceleration performance, the shift characteristic, the cruising performance, the passing performance and the upward and downward slope performance.

It is a multi-speed ratio apparatus, which is connected with a drive member (for example, an engine, a motor or a transmission) and a driven member (for example, an axis, a differential gear or an axle) and this unit has at least one revolving speed converter. This revolving speed converter has the cams 30, 33 of a conjugate pair and the reaction disc 32 which mutually connects the cams 30, 33 of the conjugate pair, and this reaction disc 32 can connect the cams 30, 33 of the conjugate pair workably and also includes a fixed member.