A sphere circulating apparatus capable of extracting a falling motion energy of a plurality of spheres circulating with repeatedly falling and rising within the apparatus, in which each sphere falls in a falling chamber, dives into liquid at a second liquid surface formed at a lower end of the falling chamber and rises in a rising chamber by the buoyancy force while pushing upward-opening check valves open one after another; each sphere then rises up to a first liquid surface formed at an upper end aperture of the rising chamber and pushes another sphere at the upper end aperture out from the first liquid surface; each sphere pushed out further shifts to an upper end aperture of the falling chamber and falls in the falling chamber toward the second liquid surface.