To solve the problem of the conventional wave force power generator having high efficiency that the ocean civil work cost is very high to obstruct the supply of practical and inexpensive wave generated power, and in the floating body system wave force power generator not requiring ocean civil work cost, the efficient power obtaining from wave force is obstructed by rocking of the floating body due to wave to be far from the efficiency of practical use.

In this floating body type wave force power generator, a pendulous type wave force power generating means is provided in a water chamber having an opening for receiving advancing wave from the front, and on the other hand, a vertical plate and a horizontal plate are provided in positions with a phase lag of 180° of the wave in positions downstream 1/2 wavelength from the pendulous position, and firmly fixed to the body of a hull including the water chamber. In addition, the vertical load of seawater applied to the water chamber is conformable to the buoyancy of the hull.

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