To provide an electrode for oxidation which is low in price, high in current efficiency, suppressed in metal elusion and long in life in order to solve a problem that, in a conventional oxidation and sterilization technology used in ozone electrolysis, an electrolytic electrode for oxidation has been created through a trial and error process, the creation has been explained by an unreliable concept such as a "catalyst effect" which is unreliable in content, accordingly, a costly and unstable material is obligatorily used, furthermore, high current density is required, and thereby current efficiency has been lowered.

The electrolysis of water which generates ozone for oxidation is logically explained by a nanotechnology. There are found an effect that an oxide substance such as ozone can be generated by a tunnel effect of an insulation film which is arranged on the outside surface of an conductive base body of a positive electrode, and an effect that the oxide substance can be generated irrespective of the kind of a film substance as far as the insulation film is rigid and has a thickness of a nanosize. By using SUS430 stainless steel as a representative conductive base body, a passive film inherent to the stainless steel is used for the insulation film.