NOVELTY - A titanium base material (1) has titanium plate (2) containing carbon having concentration of pentatomic% or more, and bond energy of 280-284 eV. Titanium plate has unalloyed titanium or titanium alloy. The titanium base material has metal coating film (3) formed on surface of the titanium plate, and the oxide film (4) formed on surface of metal coating film. Metal coating film contains titanium and/or zirconium. The oxide film has metal oxides of titanium and/or zirconium. A fuel cell separator (11) formed using titanium base material has noble metal film (12).    USE - Titanium base material is used for manufacture of fuel cell separator (claimed). Uses include but are not limited to polymer electrolyte fuel cell, alkali electrolyte-type fuel cell, phosphoric acid fuel cell, melting carbonate type fuel cell, solid oxide fuel cell for lead storage battery and dry cell used as power supply for electric vehicle, domestic cogeneration system, mobile telephone and personal computer.    ADVANTAGE - The titanium base material provides fuel cell separator having low contact resistance for long time.    DETAILED DESCRIPTION - A titanium base material has titanium plate containing carbon having concentration of pentatomic% or more, and bond energy of 280-284 eV measured by X-ray-photoelectron-spectroscopy analysis from the surface to the specified depth. The titanium plate has unalloyed titanium or titanium alloy. The titanium base material has metal coating film formed on the surface of the titanium plate, and the oxide film is formed on the surface of metal coating film. The film thickness of metal coating film is 15-500 nm. The metal coating film contains titanium and/or zirconium. The oxide film has metal oxides of titanium and/or zirconium. INDEPENDENT CLAIMS are included for the following:    (1) fuel cell separator; and    (2) manufacture of fuel cell separator.    DESCRIPTION OF DRAWING(S) - The drawings show the sectional view of structure of titanium base material and structure of fuel cell separator. (Drawing includes non-English language text)    Titanium base material (1)    Titanium plate (2)    Metal coating film (3)    Oxide film (4)    Fuel cell separator (11)    Noble metal film (12)