Construction machine

A construction machine comprising:

• a hydraulic pump that is driven by an engine;
• a pump torque adjustment device to adjust pump torque of the hydraulic pump in response to a pump torque target value;
• a hydraulic actuator to be operated by delivery pressure of the hydraulic pump;
• a motor generator connected to the engine;
• an inverter and an electricity storage device configured to drive the motor generator;
• and
• a controller configured to calculate the pump torque target value, characterized in that:
• the controller
• includes an index acquiring section configured to acquire at least any one of a current integrating value acquired by integrating a current value of a current flowing to the motor generator from the electricity storage device, and a charging rate reduction amount of the electricity storage device, as an index, and
• acquires a pump torque adjustment amount for correcting the pump torque target value, based on a deviation between the index acquired by the index acquiring section when the hydraulic actuator is driven, and an index reference value acquired by measuring the index in advance by using a reference engine and a reference hydraulic pump as references.