In order to obtain an electric power generator equipment capable of efficiently generating electric power and capable of reducing cost, without a water bath and constructive maximum height, the electric power generator equipment comprises a floating member for floating on a water surface, a power generator installed on an upper surface of the floating member, a cage suspended from a lower end of the floating member and held to a water bottom, a pair of floating bodies positioned in the cage which is separated, a wire rope whose both ends are fixed to the cage, and an air filling-up apparatus for filling up air to each of the floating bodies. The wire rope is winded to a pulley installed an end portion of each floating body and is winded to a pulley installed on the power generator.