The disclosure provides a fuel-cell separator excellent in conductivity and a method for producing the separator.
A fuel-cell separator comprising a metal substrate and a surface layer formed on a surface of the substrate, wherein the surface layer comprises an antimony-containing tin oxide film in an outermost surface thereof, and the antimony-containing tin oxide film has a value (%) representing orientation of the (200) plane and calculated in accordance with Expression (1): [ Mathematical ⁢ ⁢ Expression ⁢ ⁢ 1 ] ⁢ Peak ⁢ ⁢ intensity ⁢ ⁢ of ⁢ ⁢ ( 200 ) ⁢ ⁢ plane / 21 Peak ⁢ ⁢ intensity ⁢ ⁢ of ⁢ ⁢ ( 110 ) ⁢ ⁢ plane / 100 + peak ⁢ ⁢ intensity ⁢ ⁢ of ⁢ ⁢ ( 101 ) ⁢ ⁢ plane / 75 + peak ⁢ ⁢ intensity ⁢ ⁢ of ⁢ ⁢ ( 200 ) ⁢ ⁢ plane / 21 × 100 Expression ⁢ ⁢ ( 1 ) where individual peak intensity values are obtained by X-ray diffraction, of 35 or more.