Hydraulic driving system

A hydraulic driving system (1) is provided with a meter-in compensator (37) and a bleed-off compensator (42), the hydraulic driving system further including a plurality of sensors (64 to 68), a controller (62), and an exit pressure changeover valve (61). The controller (62) determines whether the state of a wheel loader (2) as detected on the basis of outputs from the sensors (64 to 68) satisfies a predetermined steering regulating condition. If it is determined that the steering regulating condition is satisfied, the controller (62) outputs a command signal to the exit pressure changeover valve (61). On the basis of the command signal, the exit pressure changeover valve (61) makes the flow rate of hydraulic oil that flows in a steering cylinder (18L, 18R) smaller than a flow rate corresponding to the amount of steering operation of a steering device (35).