Problem to be solved: to provide a small-sized hydroelectric power generation apparatus which can easily be installed in a mountainous area where nature is dense, and can easily cope with the variable power generation.A water wheel 10 for receiving the hydraulic force and rotating the rotary output shaft 11 in a predetermined rotation directionA plurality of power generating units 20 for generating power based on the rotation of a flywheel disposed via a one-way clutch with respect to the rotary shaftRotate the two axes of the two power generating units to be coaxial and rotate togetherOne or more coupling means 30 capable of coupling the front end of the other rotary shaft to the rear end of one rotary shaft.The plurality of power generating units are arranged in a row so as to coincide with the axis of the rotary shaft, and adjacent ones are connected by connecting means.An additional connection of additional power generation units is possible by connection means behind the outermost power generation unit.Diagram
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