Reducing vibration during rotationFirst vertical rotary shaft 11 andTo rotate coaxial with the first vertical rotary shaftThe second vertical rotary shaft 12 supported on the first vertical rotary shaft 11A plurality of first horizontal shafts 13 radially extending from the periphery of the first vertical rotary shaftA plurality of second horizontal shafts 14 radially extending from the periphery of the second vertical rotary shaftA first movable blade 15, which is disposed at each of the first horizontal shafts 11 and is capable of rotating about 90 degrees around the first horizontal axis 11 only between the pressure receiving position where the pressure receiving surface 15A receiving the wind is substantially vertical and the pressure receiving position where the pressure receiving surface 15A becomes substantially horizontal, isA second movable blade 16 which is disposed on the second horizontal shaft 12 and is capable of rotating around the second horizontal axis 12 in contrast to the first movable blade 15, andIt has a configuration.Diagram
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