A power generating apparatus of a renewable energy type which generates power from a renewable energy, comprising: a hub on which a rotor blade is mounted and which is rotated by the renewable energy received via the rotor blade; a rotating shaft which is connected to the hub via a front part of the rotation shaft; a hydraulic pump which is mounted on a rear part of the rotating shaft and which is driven by rotation of the rotating shaft; a hydraulic motor which is driven by pressurised oil from the hydraulic pump; a generator which is coupled to the hydraulic motor; characterized in that the power generating apparatus further comprises: a support which provides a reaction torque to the hydraulic pump from the rotating shaft while allowing a displacement of the hydraulic pump in a direction perpendicular to the axis of the rotating shaft, the hydraulic pump being supported by a nacelle through the support; a pressurised-oil piping which is at least partially constituted of a flexible tube and which connects an outlet port of the hydraulic pump to an inlet port of the hydraulic motor to supply the pressurised oil from the hydraulic pump to the hydraulic motor; wherein the hydraulic motor is arranged lateral relative to the axis of the hydraulic pump and the generator is located between the hub and the hydraulic motor; and wherein the outlet port is arranged in a front end plate constituting an end face of the hydraulic pump located on a side facing towards the hub. a hub on which a rotor blade is mounted and which is rotated by the renewable energy received via the rotor blade; a rotating shaft which is connected to the hub via a front part of the rotation shaft; a hydraulic pump which is mounted on a rear part of the rotating shaft and which is driven by rotation of the rotating shaft; a hydraulic motor which is driven by pressurised oil from the hydraulic pump; a generator which is coupled to the hydraulic motor; characterized in that the power generating apparatus further comprises: a support which provides a reaction torque to the hydraulic pump from the rotating shaft while allowing a displacement of the hydraulic pump in a direction perpendicular to the axis of the rotating shaft, the hydraulic pump being supported by a nacelle through the support; a pressurised-oil piping which is at least partially constituted of a flexible tube and which connects an outlet port of the hydraulic pump to an inlet port of the hydraulic motor to supply the pressurised oil from the hydraulic pump to the hydraulic motor; wherein the hydraulic motor is arranged lateral relative to the axis of the hydraulic pump and the generator is located between the hub and the hydraulic motor; and wherein the outlet port is arranged in a front end plate constituting an end face of the hydraulic pump located on a side facing towards the hub. a support which provides a reaction torque to the hydraulic pump from the rotating shaft while allowing a displacement of the hydraulic pump in a direction perpendicular to the axis of the rotating shaft, the hydraulic pump being supported by a nacelle through the support; a pressurised-oil piping which is at least partially constituted of a flexible tube and which connects an outlet port of the hydraulic pump to an inlet port of the hydraulic motor to supply the pressurised oil from the hydraulic pump to the hydraulic motor; wherein the hydraulic motor is arranged lateral relative to the axis of the hydraulic pump and the generator is located between the hub and the hydraulic motor; and wherein the outlet port is arranged in a front end plate constituting an end face of the hydraulic pump located on a side facing towards the hub.