NOVELTY - The flowing water utilization type hydraulic power unit has a water receptacle runner (6) that is attached to a carrier (2) so that attachment or detachment is possible. A power transmission roller (2c) engages/disengages in parallel with carrier on side surface of a recessed unit formed between wings of a screw (4). A water receptacle runner receives a water flow (9) and carrier works by guiding to an elliptical guide rail (1). The screw rotates through power transmission roller and a generator (5) is arranged in a row by screw and rotated to produce electric power.    USE - Hydraulic power unit utilizing flowing water resource such as river, irrigation canal, water and sewer services or drainage-gutter for producing electric power.    ADVANTAGE - The hydraulic power unit can produce electric power by making into an energy source the water flow which exists close, and it is possible to provide a hydraulic power unit, without using a chain, a sprocket, and a rotating shaft, so that the frequent maintenance is unnecessary. Since the guide rail and the guide roller are used, abrasion can also keep natural environment small as much as possible. Since a water receptacle runner can be attached or detached, it can change the distance between water receptacle runners easily and can respond to the flow volume of a water flow, and the change of the flow velocity, and can be generated efficiently. Since it is possible to make the width of a water receptacle runner wide and to receive more water flows, the output of a generator can be made to be improved. The generator can be acceleratingly rotated, when the gearwheel of the number of teeth smaller than the number of teeth of the gearwheel formed in the outer peripheral part of the wing of a screw is attached to the rotating shaft of a generator, or when forming in the outer peripheral portion of the rotor of an outer-rotor type generator, so that the output of a generator can be improved. Since the flow of water is generated between water receptacle runners corresponding to the flow volume of a water flow, and the change of the flow velocity, the dead water state of the water between water receptacle runners is eliminated, thus the operation of a water receptacle runner can be made smooth and apparatus itself can be reduced in size.    DETAILED DESCRIPTION - The flowing water utilization type hydraulic power unit has an elliptical guide rail whose elliptical major axis direction is formed parallel with respect to a flowing water surface, so that elliptical short axis direction becomes vertical with respect to a flowing water surface. The elliptical guide rail connects at equal intervals in a continuous stick so that many carriers guided to the elliptical guide rail are circulatingly driven. The carriers are several sets of guide rollers guided to the elliptical guide rail. A power transmission roller is rotatably attached to the required position of the plate which supports the guide roller, and its plate.    DESCRIPTION OF DRAWING(S) - The drawing shows the side view illustrating the schematic structure of the hydraulic power unit.    Elliptical guide rail (1)    Carrier (2)    Power transmission roller (2c)    Screw (4)    Generator (5)    Water receptacle runner (6)    Water flow (9)