Belt type transmission

In a belt type transmission, to improve the durability of a support portion of a driven shaft by reducing load acting on a driven shaft, and to improve the durability of the belt and reduce noise by suppressing vibration of a driven pulley. A belt type transmission (T) comprises a driven pulley (51) having a fixed pulley piece (57) on the driven side and a movable pulley piece (58) on the driven side, and fitted to a driven shaft (53). The fixed pulley piece (57) on the driven side is rotatably supported, respectively, on the driven shaft (53) and a bearing holder (61), being a constructional element of a transmission case. The bearing holder(61) has a size overlapping only the driven pulley (51), of the driving pulley (50) and the driven pulley (51), seen from the direction along the driven shaft (53), and hence is coupled to a left case (38), which is a constructional element of the transmission case, in the vicinity of the driven pulley (51). As a result, the rigidity for supporting the fixed pulley piece (57) on the driven side can be increased, thereby enabling suppression of vibration by the driven pulley (51).