A hydraulic shovel (1) comprises: a hydraulic pump (22) driven by an engine (20); a hydraulic pump electromagnetic proportional valve (24) that adjusts the pump torque of the hydraulic pump (22) in accordance with a pump torque target value (Tp); a hydraulic actuator activated by the discharge pressure of the hydraulic pump (22); a motor generator (30) connected to the engine (20); and a controller (26) that calculates the pump torque target value (Tp). The controller (26) derives a pump torque corrected amount (Qadj) on the basis of the differential (delta AH) between a current integrated reference value (AH0) and a current integrated value (AH1) obtained by integrating the current value flowing to the motor generator (30) when the hydraulic actuator is driven.