NOVELTY - A concave portion is formed on at least one portion of the substrate surface during formation process (S1). The concave portion is immersed in an acid solution comprising ions of noble metals. Deposition of noble metals on substrate surface is carried out during adhesion process (S2). An island-like crystal comprising noble metals is formed on the substrate surface during heat treatment process (S3). Thus, manufacture of separator is carried out.    USE - Manufacture of separator used for fuel cell (claimed) such as polymer electrolyte fuel cell used for mobile telephone, personal computer and electric vehicles.    ADVANTAGE - The method simply and economically provides separator with excellent contact resistance. The fuel cell comprising the separator maintains contact resistance for long period.    DETAILED DESCRIPTION - A concave portion is formed on at least one portion of the substrate surface during formation process. The concave portion is immersed in an acid solution comprising ions of noble metals. Deposition of noble metals on substrate surface is carried out during adhesion process. An island-like crystal comprising noble metals is formed on the substrate surface during heat treatment process. Thus, manufacture of separator is carried out. The substrate is made of titanium or titanium alloy. The concave portion is formed for forming gas flow path for distributing gas. The noble metals are selected from ruthenium, rhodium, palladium, osmium, iridium, platinum and/or gold. During adhesion process the substrate is adhered with noble metals and the substrate surface is heated during heat treatment process. A titanium oxide layer is formed on the portion where the island-like crystals are not formed, during heat treatment process. The titanium oxide layer contains rutile type crystal and/or brookite type crystal.    DESCRIPTION OF DRAWING(S) - The drawing shows the flowchart of the manufacturing method of separator. (Drawing includes non-English language text).    Formation process (S1)    Adhesion process (S2)    Heat treatment process (S3)