A work vehicle comprising: an engine; a hydraulic pump driven by the engine; a travel device driven by the engine; a power transmission device that transmits driving power from the engine to the travel device; and a power take-off device for distributing driving power from the engine to the hydraulic pump and the power transmission device; a control unit for controlling the hydraulic pump and the power transmission device; wherein, the power transmission device has: an input shaft; an output shaft; a gear mechanism that has a planetary gear mechanism (68, 69) and that transmits rotation of the input shaft to the output shaft; and a motor (MG1, MG2) connected to rotating elements of the planetary gear mechanisms (68, 69); and the power transmission device is configured so that a rotation speed ratio of the output shaft with respect to the input shaft is changed by changing the rotation speed of the motor (MG1, MG2), and the control unit has: a pump brake control determining unit that determines whether to execute a pump brake control for causing braking force to be generated by using a load on the hydraulic pump during braking; and a pump brake torque control unit that increases the pump brake torque that corresponds to the load on the hydraulic pump during the pump brake control, characterised in that the pump brake control determining unit determines that the pump brake control is to be executed when an engine regenerative torque regenerated in the engine from the travel device through the power transmission device is equal to or greater than a predetermined torque threshold. an engine; a hydraulic pump driven by the engine; a travel device driven by the engine; a power transmission device that transmits driving power from the engine to the travel device; and a power take-off device for distributing driving power from the engine to the hydraulic pump and the power transmission device; a control unit for controlling the hydraulic pump and the power transmission device; the power transmission device has: an input shaft; an output shaft; a gear mechanism that has a planetary gear mechanism (68, 69) and that transmits rotation of the input shaft to the output shaft; and a motor (MG1, MG2) connected to rotating elements of the planetary gear mechanisms (68, 69); and the power transmission device is configured so that a rotation speed ratio of the output shaft with respect to the input shaft is changed by changing the rotation speed of the motor (MG1, MG2), and the control unit has: a pump brake control determining unit that determines whether to execute a pump brake control for causing braking force to be generated by using a load on the hydraulic pump during braking; and a pump brake torque control unit that increases the pump brake torque that corresponds to the load on the hydraulic pump during the pump brake control, characterised in that the pump brake control determining unit determines that the pump brake control is to be executed when an engine regenerative torque regenerated in the engine from the travel device through the power transmission device is equal to or greater than a predetermined torque threshold. an input shaft; an output shaft; a gear mechanism that has a planetary gear mechanism (68, 69) and that transmits rotation of the input shaft to the output shaft; and a motor (MG1, MG2) connected to rotating elements of the planetary gear mechanisms (68, 69); and the power transmission device is configured so that a rotation speed ratio of the output shaft with respect to the input shaft is changed by changing the rotation speed of the motor (MG1, MG2), and the control unit has: a pump brake control determining unit that determines whether to execute a pump brake control for causing braking force to be generated by using a load on the hydraulic pump during braking; and a pump brake torque control unit that increases the pump brake torque that corresponds to the load on the hydraulic pump during the pump brake control, characterised in that the pump brake control determining unit determines that the pump brake control is to be executed when an engine regenerative torque regenerated in the engine from the travel device through the power transmission device is equal to or greater than a predetermined torque threshold. a pump brake control determining unit that determines whether to execute a pump brake control for causing braking force to be generated by using a load on the hydraulic pump during braking; and a pump brake torque control unit that increases the pump brake torque that corresponds to the load on the hydraulic pump during the pump brake control, characterised in that the pump brake control determining unit determines that the pump brake control is to be executed when an engine regenerative torque regenerated in the engine from the travel device through the power transmission device is equal to or greater than a predetermined torque threshold.