PROBLEM TO BE SOLVED: To introduce a power generating device utilizing circulation type clean natural energy showing no sympathy about lack of natural resources in the future so as to eliminate dependency in the future based on lack of safety and natural resources found under the present main trend of a power generating system based on nuclear energy or fossil fuel and performing stable supply of electricity.SOLUTION: This invention is a wave power generating device characterized in that it is constituted by a rotating shaft, a conical surface expanded from the bottom part of the rotating shaft, a shaft connected from the rotating shaft toward the outer periphery of the conical surface, a main body having a weight connected to the shaft stored in it and floated on the water surface under a shape of inverse conical surface with its apex being faced downward, a power generator having a rotor connected to the rotating shaft, a fixing part for fixing the main body to a water bottom part, and a mooring part for co
