To provide a construction machinery simply and effectively moving an arm body of a boom, arm, bucket, etc., in an anti-self-weight direction using a pressure oil discharged from a sub pump, without using a pressure oil discharged from a main pump.

When the contents of an operation for moving the arm body 4 in the anti-self-weight direction at a speed less than the predetermined speed are detected, a main controller 60 of the construction machinery 1 prohibits the pressure oil discharged from a first hydraulic pump 10R from flowing into a hydraulic actuator 7 corresponding to the arm body 4, and permits the pressure oil discharged from a second hydraulic pump 55 to flow into a hydraulic actuator 6 corresponding to the arm body 4.