A power generating apparatus is provided which has a simple configuration with excellent maintainability and power generation efficiency. A power generating apparatus 100 includes an inlet pipe 101, a rotational coupling unit 102, a generator 110, and a rotating blade 120. The inlet pipe 101 is connected to a supply source of a liquid WK and guides the liquid WK to the rotational coupling unit 102. The rotational coupling unit 102 rotatably couples an input shaft 112 of the generator 110 to the inlet pipe 101. The input shaft 112 configures a rotor in the generator 110 and is formed into a pipe that conveys the liquid WK to a base pipe 121 of the rotating blade 120 to function as piping. The generator 110 generates electric power on the basis of rotary motion of the input shaft 112. The rotating blade 120 includes two arm pipes 123 on an outer side in a radial direction of the base pipe 121 formed into a pipe, and is rotationally driven by jetting the liquid WK along a circumferential direction of the base pipe 121 through a discharge tube 124 provided at a distal end portion of each of the arm pipes 123.