NOVELTY - The apparatus has a generator (35) coupled to a hydraulic motor (30). A support (7) provides reaction torque to a hydraulic pump (20) from a rotating shaft while allowing displacement of the hydraulic pump along a direction perpendicular to an axis of the rotating shaft. The hydraulic pump is supported by a nacelle through the support. A pressurized-oil piping is partially provided with a flexible tube (43) for connecting an outlet port (24a) of the hydraulic pump to an inlet port (31) of the hydraulic motor to supply pressurized oil from the hydraulic pump to the hydraulic motor.    USE - Renewable energy type power generating apparatus i.e. propeller type wind turbine generator, for generating power from renewable energy e.g. wind. Can also be used as a tidal generator, an ocean current generator and a river current generator for generating power from a tidal current, ocean current and river current.    ADVANTAGE - The support is arranged in a manner, so that the hydraulic pump is supported by the nacelle via the support and the support provides the reaction torque to the hydraulic pump from the rotating shaft while allowing the displacement of the hydraulic pump along orthogonal direction, thus making possibility to reduce a concentrated load on a main shaft bearing and a pump bearing caused by bending of the rotating shaft while preventing a stationary part of the hydraulic pump from rotating with the rotating shaft. The pressurized-oil piping is partially arranged with a flexible tube such that the relative displacement between the hydraulic pump and the hydraulic motor is absorbed by deformation of a flexible tube to reduce the load on a piping. The pressurized-oil piping is partially formed by the flexible tube, thus making possibility to effectively absorb thermal expansion of the pressurized-oil piping by the deformation of the flexible tube, and suppressing generation of heat stress. The hydraulic motor attached to an arm part is fluidly connected with the hydraulic pump via an internal flow path formed inside an end plate, thus avoiding necessary of providing the piping between the hydraulic pump and the hydraulic motor, and hence avoiding issues which arise in a case of providing the piping between the hydraulic pump and the hydraulic motor.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of hydraulic transmission and a generator.    Support (7)    Hydraulic pump (20)    Outlet port (24a)    Hydraulic motor (30)    Inlet port (31)    Generator (35)    Flexible tube (43)