To reduce noise generated from a working vehicle by surely reducing pulsation, even if the pulsation is generated by working fluid discharged from a hydraulic pump and the pulsation is amplified by a joint.

This actuator driving device 40 is provided in the dust working vehicle including a dust loading device for loading dust fed into a tail gate into a body, a hydraulic actuator 41 for driving the dust loading device, operation control valves 50-54 for performing working fluid supply and discharge control for the hydraulic actuator 41 and a hydraulic pump P for supplying the working fluid to the operation control valves 50-54. An accumulator 56 is provided in a pump oil passage 60 for linking an elbow joint 57 connected to a discharge port of the hydraulic pump P and the operation control valve 50.