An industrial vehicle (1;14) comprising: an engine that is a driving source; a hydraulically-operated device that is arranged to be operated by oil pressure; a hydraulic pump that is arranged to be driven by the engine and supply hydraulic oil to the hydraulically-operated device; hydraulic piping that connects the hydraulic pump and the hydraulically-operated device; discharge piping that branches from the hydraulic piping and is connected to a tank; a switching valve that is provided in the discharge piping and is capable of switching opening or closing of the discharge piping; a rotation speed sensor arranged to detect the rotation speed of the engine; a control device arranged to close the discharge piping by controlling the switching valve in a case where a rotation speed of the engine which is detected by the rotation speed sensor is larger than a predetermined value, and open the discharge piping by controlling the switching valve in a case where the rotation speed of the engine which is detected by the rotation speed sensor is less than or equal to a predetermined value; a valve arranged to adjust the flow rate of the hydraulic oil which is discharged from the discharge piping to the tank, on the basis of the flow rate of the hydraulic oil which flows from the hydraulic pump into the hydraulic piping, and bypass piping that connects a position further to the upstream side than the switching valve in the discharge piping and a position further to the downstream side than a branching position of the discharge piping in the hydraulic piping, wherein the switching valve and the valve are serially connected to the discharge piping, and wherein the valve is provided at the branching position and is arranged to distribute the hydraulic oil flowing from the hydraulic pump into the hydraulic piping, thereby making a preset flow rate of hydraulic oil flow to a side of the hydraulically-operated device and a remaining hydraulic oil flow to the discharge piping. an engine that is a driving source; a hydraulically-operated device that is arranged to be operated by oil pressure; a hydraulic pump that is arranged to be driven by the engine and supply hydraulic oil to the hydraulically-operated device; hydraulic piping that connects the hydraulic pump and the hydraulically-operated device; discharge piping that branches from the hydraulic piping and is connected to a tank; a switching valve that is provided in the discharge piping and is capable of switching opening or closing of the discharge piping; a rotation speed sensor arranged to detect the rotation speed of the engine; a control device arranged to close the discharge piping by controlling the switching valve in a case where a rotation speed of the engine which is detected by the rotation speed sensor is larger than a predetermined value, and open the discharge piping by controlling the switching valve in a case where the rotation speed of the engine which is detected by the rotation speed sensor is less than or equal to a predetermined value; a valve arranged to adjust the flow rate of the hydraulic oil which is discharged from the discharge piping to the tank, on the basis of the flow rate of the hydraulic oil which flows from the hydraulic pump into the hydraulic piping, and bypass piping that connects a position further to the upstream side than the switching valve in the discharge piping and a position further to the downstream side than a branching position of the discharge piping in the hydraulic piping, wherein the switching valve and the valve are serially connected to the discharge piping, and wherein the valve is provided at the branching position and is arranged to distribute the hydraulic oil flowing from the hydraulic pump into the hydraulic piping, thereby making a preset flow rate of hydraulic oil flow to a side of the hydraulically-operated device and a remaining hydraulic oil flow to the discharge piping.