Abstract: Heliostat apparatus, including frame supporting reflection mirror or solar battery panel, gyro mechanism having elevation angle rotation axis for rotating frame in a north-south direction and azimuth angle rotation axis for rotating it in east-west direction, rotation axes being orthogonal to each other, and support for supporting frame through the gyro mechanism, in which frame, reflection mirror and like are integrally rotated in north-south direction with elevation angle rotation axis as rotation axis and angle of reflection surface of reflection mirror and like in north-south direction is adjusted, frame, reflection mirror and like are integrally rotated in east-west direction with azimuth angle rotation axis as rotation axis and angle of reflection surface of reflection mirror and like in east-west direction is adjusted, and center of gravity of a power generation panel is matched with intersection where elevation and azimuth angle rotation axis of gyro mechanism are orthogonal to each other.