Construction machine

A construction machine comprising:

• a hydraulic actuator;
• a hydraulic pump that supplies hydraulic fluid to the hydraulic actuator;
• a control valve that switchingly supplies the hydraulic fluid from the hydraulic pump to the hydraulic actuator;
• an operation lever device that switchingly operates the control valve;
• a control valve drive device that supplies pilot secondary hydraulic fluid to the control valve in accordance with an operation of the operation lever device;
• a pilot hydraulic pump that supplies pilot primary hydraulic fluid to the control valve drive device;
• and a pressure accumulation device that recovers return hydraulic fluid returned from the hydraulic actuator,
• wherein the construction machine further comprises:
• a check valve provided in a line between the pilot hydraulic pump and the control valve drive device;
• a pressure reducing valve that supplies the hydraulic fluid accumulated in the pressure accumulation device to a line between the check valve and the control valve drive device;
• a flow rate reduction device capable of reducing flow rate of the hydraulic fluid delivered by the pilot hydraulic pump;
• a pressure detection device capable of detecting pressure in the line between the check valve and the control valve drive device;
• and a controller that controls the flow rate reduction device in accordance with the pressure detected by the pressure detection device.