SEPARATOR FOR FUEL BATTERIES AND FUEL BATTERY

A means for imparting low contact resistance and excellent corrosion resistance under highly corrosive environments, such as environments in the presence of a fluoride ion, to a separator for fuel batteries includes a separator for fuel batteries including a metal base material and a tin oxide film formed on a surface of the metal base material, in which the tin oxide film is tin oxide containing zirconium, and an element ratio of zirconium to tin (Zr/Sn) is in a range of 0.10 to 0.70.