WORK VEHICLE

The present invention provides a technology that makes it possible to improve operation performance and reduce the time and financial costs needed for research and development. The present invention comprises: an operation tool (slewing lever 21) that is operated by an operator; and a controller 20 that determines a target flow rate for hydraulic oil fed to a hydraulic device (motor 31 for slewing) on the basis of the amount of operation of the operation tool (21). The controller 20 calculates a bleed-off target flow rate Qb on the basis of the flow rate of hydraulic oil fed from a hydraulic oil pump 35 and the target flow rate for hydraulic oil fed to the hydraulic device (31), calculates a bleed-off throttle differential pressure Pp-Pr on the basis of a pressure Pp of hydraulic oil fed from the hydraulic oil pump 35 and a pressure Pr of hydraulic oil in a hydraulic oil tank 36, calculates a bleed-off target opening area At on the basis of the bleed-off target flow rate Qb and the bleed-off throttle differential pressure Pp-Pr, and controls a hydraulic oil control valve 37 such that the bleed-off target opening area At is achieved.