A power generating apparatus of renewable energy type for generating power from renewable energy, the apparatus comprising: a blade; a hub supporting the blade; a rotation shaft configured to be rotated by the renewable energy inputted via the blade; a nacelle housing the rotation shaft; a hydraulic pump configured to be driven by the rotation shaft to pressurize operating oil in a working chamber and discharge the pressurized operating oil; a hydraulic motor configured to be driven by the operating oil discharged from the hydraulic pump; a generator connected to the hydraulic motor; an oil line for returning the operating oil from the hydraulic motor to the working chamber of the hydraulic pump; an oil line cooler provided in the oil line for cooling the operating oil flowing in the oil line by heat exchange with a coolant; a coolant line for supplying the coolant to the oil line cooler; characterized in that the apparatus further comprises a branch line branching from the oil line for introducing the operating oil to a lubrication object of at least one of the hydraulic pump or the hydraulic motor; and a branch line cooler provided in the branch line for cooling the operating oil flowing in the branch line by heat exchange with a coolant, wherein two flows of the operating oil cooled by the oil line cooler and the branch line cooler to different temperatures are supplied to the working chamber and the lubrication object via the oil line and the branch line, respectively. a blade; a hub supporting the blade; a rotation shaft configured to be rotated by the renewable energy inputted via the blade; a nacelle housing the rotation shaft; a hydraulic pump configured to be driven by the rotation shaft to pressurize operating oil in a working chamber and discharge the pressurized operating oil; a hydraulic motor configured to be driven by the operating oil discharged from the hydraulic pump; a generator connected to the hydraulic motor; an oil line for returning the operating oil from the hydraulic motor to the working chamber of the hydraulic pump; an oil line cooler provided in the oil line for cooling the operating oil flowing in the oil line by heat exchange with a coolant; a coolant line for supplying the coolant to the oil line cooler; characterized in that the apparatus further comprises a branch line branching from the oil line for introducing the operating oil to a lubrication object of at least one of the hydraulic pump or the hydraulic motor; and a branch line cooler provided in the branch line for cooling the operating oil flowing in the branch line by heat exchange with a coolant, wherein two flows of the operating oil cooled by the oil line cooler and the branch line cooler to different temperatures are supplied to the working chamber and the lubrication object via the oil line and the branch line, respectively. a branch line branching from the oil line for introducing the operating oil to a lubrication object of at least one of the hydraulic pump or the hydraulic motor; and a branch line cooler provided in the branch line for cooling the operating oil flowing in the branch line by heat exchange with a coolant, wherein two flows of the operating oil cooled by the oil line cooler and the branch line cooler to different temperatures are supplied to the working chamber and the lubrication object via the oil line and the branch line, respectively.