In order to provide a separator for fuel cells, or a current collecting member for fuel cells, which has low contact resistance, excellent corrosion resistance and which can be economically manufactured, and a manufacturing method thereof, this separator 110 for fuel cells comprises a substrate 11 having iron or aluminum as the main component, a gas barrier film 12 formed directly on said substrate 11 and having excellent corrosion resistance, and a conductive resin film 13 formed on the gas barrier film 12 and containing a conductive ceramic or graphite particles having a particle diameter of 1-20 μm.