A steel cord for reinforcing a rubber article is provided that has excellent corrosion resistance and producibility without damaging adhesion with the rubber. A steel cord 1 for reinforcing a rubber article, the steel cord 1 being obtained by twisting together multiple steel filaments 2, wherein the steel cord for reinforcing a rubber article has a core comprising at least one core filament 2c, and a sheath comprising at least one sheath layer obtained by twisting at least one sheath filament 2s around the core, brass plating being applied to the steel filaments 2, and zinc plating being further applied to the outer periphery of the brass plating of the core filament 2c, the diameter d of the steel filaments 2 being 0.1-0.6 mm.
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