To provide a floating structure excellent in environmental protection, capable of stably mooring on a fixed shore position, always floating on the surface of water even when water level is changed by water level rising, water shortage, or the like, usable as a life-saving device when a person falls into a river, or the like, when reaches to the structure even if in water level raising and thereby excellent in safety, improving waterside view by giving a floating island on a dull concrete revetment, steel sheet pile revetment, or the like, excellent in workability without requiring large-scale construction because the structure can be easily set on an existing dike, constructing protection bank, and the like, capable of decomposing organic materials in water by forming a microbial film and purifying water quality thereby.

This floating structure is located from a land part on a waterside to the bottom of water, comprises a mooring member one end of which is fixed on the land part, a floating body floating on the water surface, a pass-through part set or formed on the floating body and through which the mooring member passes.