NOVELTY - The device (1) has an inclination mount frame (7) placed on a base (5) and mounting a solar power generation module (6) on the base, where the base is attached with a wheel (4), which moves in a turning orbit (2) i.e. rail, and a turning orbit top. The wheel is attached to a turning part (3). The turning part is turnably placed on the turning orbit. A lower side of the base is equipped with the wheel that supports the base in the turning part. An outer peripheral surface of the wheel is attached in a state of touching the turning orbit.    USE - Solar power generation device for installation in a rooftop of a building to build large-scale electric generating facility in a big city suburban region.    ADVANTAGE - The inclination mount frame is placed on the base, and mounts the solar power generation module on the base that is attached with the wheel, which moves in the turning orbit and the turning orbit top, thus inclining the light-receiving surface of the solar power generation module to direction of sunlight in an effective manner, obtaining sufficient electric power from solar radiation with the device, increasing electric energy per unit area of the solar power generation module, and hence reducing energy required for turning of an apparatus, reducing impact generated between a outer peripheral surface of the wheel and the turning orbit and noise, decreasing useless space and unbalanced load on arrangement, and ensuring high-density positioning of the solar power generation module. The motive power mechanism consists of combination of the inclination mount frame, a motor and a propulsion apparatus, and is equipped with a floating sedimentation mechanism of a system in which the buoyancy of a float is changed, thus adjusting the inclination-angle of the solar power generation module by separately controlling a rising/sinking state of the float, and hence ensuring variation of the solar angle within a year period, converting the sunlight into electric power with high-efficiency, and reducing manufacture cost and installation cost, without requiring separate installation place.    DESCRIPTION OF DRAWING(S) - The drawing shows a top perspective view of a solar power generation device.    Solar power generation device (1)    Turning orbit (2)    Turning part (3)    Wheel (4)    Base (5)    Solar power generation module (6)    Inclination mount frame (7)