A ferritic stainless steel, solid polymer fuel cell separator and the solid polymer fuel cell using

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There is provided a ferritic stainless steel material that has a chemical composition containing, 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, in which a value calculated as {Cr content (mass%) + 3 × Mo content (mass%) - 2.5 × B content (mass%) - 17 × C content (mass%)} ranges from 20 to 45%, the ferritic stainless steel material further having a parent phase comprising only a ferritic phase, in which at least composite metallic precipitates including M 23 C 6 carbide-based metallic precipitates precipitated on surfaces and at peripheries of M 2 B boride-based metallic precipitates serving as precipitation nuclei are dispersed and exposed on a surface of the parent phase.