FUEL CELL SEPARATOR, ANTIMONY-DOPED TIN OXIDE, METHOD OF MANUFACTURING THE SAME, AND METHOD OF MANUFACTURING FUEL CELL SEPARATOR

A fuel cell separator having high corrosion resistance and electrical conductivity is provided. This fuel cell separator includes, on a substrate, an antimony-doped tin oxide film having an alkyl group substituted with at least one fluorine atom, in which an element ratio of fluorine to tin (F/Sn) in the film is 3 or more and 7 or less.