<p>A hydraulic power generator comprises a cylindrical water intake drum (14) the axial direction of which is positioned in the vertical direction and through which water flows downward, a guide member (15) which is provided in the water intake drum (14) and allows the water to flow in a specified direction, and a rotary screw (22) provided below the guide member (15) and rotated by receiving the water flown from the guide member (15). The guide member (15) includes a water throttling drum (16) positioned on the center axis of the water intake drum (14) and having a diameter gradually increased in downward direction, and a fixed screw (20) which partitions the space between the water throttling drum (16) and the water intake drum (14) along the circumference of the water intake drum (14). The mounting angle of the fixed screw (20) is made to be tilted relative to the axial direction of the water intake drum (14), and to intersect the surfaces of the rotary screw (22) that receive water.</p>
