PURPOSE: To increase yearly generated power of a wave activated power generating system by setting up a plurality of sets respectively of water flow air compressors and air turbine generators, and controlling a number of operating sets of these compressors and generators in accordance with seasonal fluctuation of a water amount stored by a wave force.

CONSTITUTION: Relating to a primary converter for producing a water level difference by a wave force, many water flow air compressors 1B1 to 1B25, having a downward directional flow pipe 11, water-air separating tank 12 and an upward directional flow pipe 13, are arranged. Many air turbine generators 1D1 to 1D6 are juxtaposed in a common air pipe 15 of connecting air pipes 14 of each water air separating tank 12. Further, each inlet valve 1A1 to 1A25 is arranged in each downward directional flow pipe 11, and also each inlet valve 1C1 to 1C6 is arranged in each air turbine generator 1D1 to 1D6. Each inlet valve 1A1 to 1A25, 1C1 to 1C6 is opened/closed by a flow amount in accordance with a storage water amount of the primary converter, to control a number of operating sets of each water flow air compressor 1B1 to 1B25 and each air turbine generator 1D1 to 1D6.