To solve the problem wherein a travel allowable speed is too low to use a load transmission bearing for a rotary blade with a shroud or an electromagnetic peripheral speed use wind turbine generator when the load transmission bearing is made of a conventional free action bearing formed of a combination of small rolling balls and a main ball.

Micropores are opened in a receptacle of the free action bearing using only either one of a ball or a roller without using the small rolling balls, and a bottom plate is provided at the bottom of a holder on the object side where the free action bearing is installed. A lubricant/additive is filled in a lubricant chamber formed in a hollow part between the receptacle and the bottom plate to constitute the related position of oil draft so that the outside of the receptacle with micropores opened is submerged in the lubricant/additive in the lubricant chamber. The lubricant/additive thereby oozes out to the ball and the roller sides inside the receptacle from the outside of the receptacle, and the ball and the roller slide on an oil film of the lubricant/additive to make the travel allowable speed of 40 m/s or higher.

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