A die cushion apparatus comprising: a double-acting hydraulic cylinder configured to move a cushion pad up and down; a first hydraulic pump configured to supply a hydraulic oil from an oil tank to a first port of the hydraulic cylinder and to drive a piston of the hydraulic cylinder upward; a second hydraulic pump configured to supply the hydraulic oil from the oil tank to a second port of the hydraulic cylinder and to drive the piston of the hydraulic cylinder downward; and a control unit configured to control a rotation speed of the first hydraulic pump and a rotation speed of the second hydraulic pump and to control a flow rate and a pressure of the hydraulic oil which the first hydraulic pump supplies to the hydraulic cylinder and a flow rate and a pressure of the hydraulic oil which the second hydraulic pump supplies to the hydraulic cylinder, characterized by further comprising: a first relief valve configured to return to the oil tank the hydraulic oil discharged from the hydraulic cylinder through the first port; and a first pressure sensor configured to detect a pressure of the hydraulic oil as a first-port -side die cushion pressure of the hydraulic cylinder, wherein the control unit controls the rotation speeds of the first and second hydraulic pumps (P1, P2) such that the pressure of the hydraulic oil detected by the first pressure sensor takes a die cushion pressure command value, and the control unit rotates the first hydraulic pump reversely when the pressure of the hydraulic oil detected by the first pressure sensor is equal to or more than a set pressure for the first relief valve. a double-acting hydraulic cylinder configured to move a cushion pad up and down; a first hydraulic pump configured to supply a hydraulic oil from an oil tank to a first port of the hydraulic cylinder and to drive a piston of the hydraulic cylinder upward; a second hydraulic pump configured to supply the hydraulic oil from the oil tank to a second port of the hydraulic cylinder and to drive the piston of the hydraulic cylinder downward; and a control unit configured to control a rotation speed of the first hydraulic pump and a rotation speed of the second hydraulic pump and to control a flow rate and a pressure of the hydraulic oil which the first hydraulic pump supplies to the hydraulic cylinder and a flow rate and a pressure of the hydraulic oil which the second hydraulic pump supplies to the hydraulic cylinder, characterized by further comprising: a first relief valve configured to return to the oil tank the hydraulic oil discharged from the hydraulic cylinder through the first port; and a first pressure sensor configured to detect a pressure of the hydraulic oil as a first-port -side die cushion pressure of the hydraulic cylinder, wherein the control unit controls the rotation speeds of the first and second hydraulic pumps (P1, P2) such that the pressure of the hydraulic oil detected by the first pressure sensor takes a die cushion pressure command value, and the control unit rotates the first hydraulic pump reversely when the pressure of the hydraulic oil detected by the first pressure sensor is equal to or more than a set pressure for the first relief valve. a first relief valve configured to return to the oil tank the hydraulic oil discharged from the hydraulic cylinder through the first port; and a first pressure sensor configured to detect a pressure of the hydraulic oil as a first-port -side die cushion pressure of the hydraulic cylinder, wherein the control unit controls the rotation speeds of the first and second hydraulic pumps (P1, P2) such that the pressure of the hydraulic oil detected by the first pressure sensor takes a die cushion pressure command value, and the control unit rotates the first hydraulic pump reversely when the pressure of the hydraulic oil detected by the first pressure sensor is equal to or more than a set pressure for the first relief valve.