To provide a work vehicle capable of achieving a lower noise operation by reducing the frequency of driving a work device using an engine as power.

A motor generator 41b is disposed between an engine 41a and a torque converter 42, and a clutch 41e for switching the connection and the release of the connection of the engine 41a and the motor generator 41b is disposed between the engine 41a and the motor generator 41b. In performing crane work, the connection of the engine 41a and the torque converter 42 is released by the clutch 41e to drive the motor generator 41b, and power is taken out from the torque converter 42 by a PTO mechanism 46 so as to drive a hydraulic pump 31.