<p>A technique for utilizing the advantages of both load sensing control and a regeneration circuit without causing any problem. The regeneration circuit is added to a hydraulic circuit equipped with a hydraulic pressure signal line for detecting the value of hydraulic pressure in the hydraulic circuit and controlling the amount of pressurized oil to a cylinder (1) with the detected value as the standard. A pressure reducing valve (6) for outputting a reduced pressure as an operation signal to a pump (2) is provided. When the regeneration circuit is in a regeneration state, control means (5) causes the pressure reducing valve (6) to output a pressure reduction command to the pump (2) to reduce the amount of discharge from the pump (2).</p>
