A metal separator for fuel cells and a production method for the separator balances high corrosion resistance and high performance of electric generation due to low contact resistance. In the metal separator for fuel cells, a passivation film is formed on the surface thereof and x (Mcm2) calculated by an equation: (VH-VL)/(B-A) is in a range of 0.0026x0.04, wherein in a sulfuric acid solution at 90 C. and pH 3, VH (V) is the highest voltage; VL (V) is the lowest voltage; A (A/cm2) is corrosion current density in power generation at the lowest voltage VL; and B (A/cm2) is corrosion current density in power generation at the highest voltage VH.

 
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