A working machine comprising: an arm ; a boom that supports the arm ; an upper revolving body that supports the boom ; a lower traveling body that mounts the upper revolving body in a rotatable state; a hydraulic actuator that is driven by relieving a hydraulic oil; a first pump that supplies the hydraulic oil to the hydraulic actuator ; a pump state detector (S2R, S2L) that detects load of the first pump ; and a controller that reduces a flow rate of the hydraulic oil from the first pump to the hydraulic actuator when the pump state detector detects a predetermined state, wherein the hydraulic actuator is a hydraulic actuator that opens and closes a grapple supported by the arm , the working machine further comprising: a control valve (171R-175R, 171L-175L) that switches a flow of the hydraulic oil in order to supply the hydraulic oil discharged from the first pump to the hydraulic actuator ; and a relief valve that causes at least a part of the hydraulic oil flowing toward the hydraulic actuator in response to a closing operation of the grapple , wherein the controller reduces a pilot pressure acting on a pilot port of the control valve when the pump state detector (S2L, S2R) detects that a pressure of the hydraulic oil flowing to the hydraulic actuator exceeds a preset pressure, which is defined based on a relief pressure of the relief valve , at time of the closing operation of the grapple . an arm ; a boom that supports the arm ; an upper revolving body that supports the boom ; a lower traveling body that mounts the upper revolving body in a rotatable state; a hydraulic actuator that is driven by relieving a hydraulic oil; a first pump that supplies the hydraulic oil to the hydraulic actuator ; a pump state detector (S2R, S2L) that detects load of the first pump ; and a controller that reduces a flow rate of the hydraulic oil from the first pump to the hydraulic actuator when the pump state detector detects a predetermined state, wherein the hydraulic actuator is a hydraulic actuator that opens and closes a grapple supported by the arm , the working machine further comprising: a control valve (171R-175R, 171L-175L) that switches a flow of the hydraulic oil in order to supply the hydraulic oil discharged from the first pump to the hydraulic actuator ; and a relief valve that causes at least a part of the hydraulic oil flowing toward the hydraulic actuator in response to a closing operation of the grapple , wherein the controller reduces a pilot pressure acting on a pilot port of the control valve when the pump state detector (S2L, S2R) detects that a pressure of the hydraulic oil flowing to the hydraulic actuator exceeds a preset pressure, which is defined based on a relief pressure of the relief valve , at time of the closing operation of the grapple . a control valve (171R-175R, 171L-175L) that switches a flow of the hydraulic oil in order to supply the hydraulic oil discharged from the first pump to the hydraulic actuator ; and a relief valve that causes at least a part of the hydraulic oil flowing toward the hydraulic actuator in response to a closing operation of the grapple , wherein the controller reduces a pilot pressure acting on a pilot port of the control valve when the pump state detector (S2L, S2R) detects that a pressure of the hydraulic oil flowing to the hydraulic actuator exceeds a preset pressure, which is defined based on a relief pressure of the relief valve , at time of the closing operation of the grapple . <EOS>