The present invention provides a fork lift (1) comprising: an engine (7); a hydraulically operated device (2) for handling cargo; a pump (5) for handling cargo driven by the engine (7); hydraulic piping (8) for handling cargo that connects the pump (5) for handling cargo and the hydraulically operated device (2) for handling cargo; discharge piping (110) branching from the hydraulic piping (8) for handling cargo and connected to a tank (4); a switching valve (11) capable of switching the discharge piping (110) between open and closed; a control device (13) that closes the discharge piping (110) when the rotation speed of the engine (7) is larger than a preset value and opens the discharge piping (110) when the rotation speed of the engine (7) drops bellow a preset value; and a sub-relief valve (112) that adjusts the amount of hydraulic oil discharged from the discharge piping (110) to the tank (4) based on the pressure or flow amount of the hydraulic oil.
