A rotation transmitter includes a first member, a second member, and an intermediate member. The first member is connected to the intermediate member by a first rotary mechanism. The second member is connected to the intermediate member by a second rotary mechanism. A second rotary mechanism includes: a second radial pin supported by a first one of the second member and the intermediate member; a plurality of pairs of rollers disposed at different positions of the second radial pin and each of the pairs of rollers holding the second radial pin therebetween; axial pins supporting the respective rollers while supported by a second one of the second member and the intermediate member; and stroke bearings respectively interposed between the rollers and the axial pins and supporting the rollers so that the rollers are rotatable around the axial pins and movable in a direction of the rotation axis.