FERRITIC STAINLESS STEEL MATERIAL, AND, SEPARATOR FOR SOLID POLYMER FUEL CELL AND SOLID POLYMER FU

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A ferritic stainless steel material contains, by mass %, C : 0.02 to 0.15%, Si : 0.01 to 1.5%, Mn : 0.01 to 1.5%, P : 0.035% or less, S : 0.01% or less, Cr : 22.5 to 35.0%, Mo : 0.01 to 6.0%, Ni : 0.01 to 6.0%, Cu : 0.01 to 1.0%, N : 0.035% or less, V : 0.01 to 0.35%, B : 0.5 to 1.0%, Al : 0.001 to 6.0%, rare earth metal : 0 to 0.10%, Sn : 0 to 2.50%, and the balance : Fe and impurities, and a value calculated in mass % as {Cr+3×Mo−2.5×B−17×C} ranges from 20 to 45%. The ferritic stainless steel material has a parent phase comprising only a ferritic phase. At least composite metallic precipitates including M23C6 carbide-based metallic precipitates precipitated on surfaces and at peripheries of M2B boride-based metallic precipitates serving as precipitation nuclei are dispersed and exposed on a parent phase surface.