To provide a electrolytic protection film capable of protecting not only the steel structures in seawater, fresh water and soil but the steel structures in the atmospheric air as well against corrosion for a long period.

The electrolytic protection films which are the electrolytic protection films consisting of two or more layers formed on the steel product surfaces include the first layers containing a solid electrolyte having cation selectpermeability and the second layers containing a solid electrolyte having anion selectpermeability. The first layers are disposed in contact with the steel product surfaces and the second layers are disposed on the upper layer of the first layers.