Abstract: A power transmission apparatus of a working machine transmits power of an engine to a drive wheel through a drive pulley, a belt, a driven pulley, an input shaft and a clutch. The driven pulley has a movable sheave fitted to the input shaft so as to rotate and move in the axial direction, and a fixed sheave fixed to the input shaft. When the clutch disconnects the movable sheave moves away from the fixed sheave, and when the clutch connects the movable sheave moves toward the fixed sheave. The engine power can be transmitted gradually avoiding abrupt transmission when the clutch connects.

Abstract: A speed change operation device for a vehicle with continuously variable transmission having a running apparatus, a power source and a continuously variable transmission for transmitting power from the power source to the running apparatus. The speed change operation device comprises a first movable member operated by a speed change operation member to rotate; a second movable member connected to a speed change operation quantity input section of the continuously variable transmission directly or indirectly through a transmission means to change speed of the continuous variable transmission; a first rotation support shaft pivotally supporting the first movable member; and a second rotation support shaft disposed in parallel with the first rotation shaft for pivotally supporting the second movable member.