Abstract: The power generation apparatus of the present invention provides a weight road that can move up and down; a moving storage tank guide box with a fluid storage part intended to collect fluid supplied from a fluid supply part provided at the top, a fluid discharge part provided at the bottom, and a supply opening and closing part provided at the bottom, and a supply opening and closing part intended to optionally discharge the fluid collected in the fluid storage part provided on the bottom of the fluid storage part; a moving storage tank with a recovery opening and closing part accommodated in the moving storage part guide box so that it can undergo up-and-down reciprocating motions between the fluid storage part and the fluid discharge part and that is intended to optionally discharge the collected fluid through the supply opening and closing part at a location adjacent to the fluid storage part to the fluid discharge part at a location adjacent to the fluid discharge part; and a power transmission unit that