TITANIUM MATERIAL, SEPARATOR, AND SOLID POLYMER FUEL CELL

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This titanium material is provided with a base material and a composite oxide coating formed on the surface of the base material. The base material has a chemical composition of 0-0.15 mass% of a platinum group element and 0-0.1 mass% of a rare earth element, with the remainder made up by Ti and impurities. The composite oxide coating includes a composite oxide of Ti and one or more elements selected from La, Ce, Nd, Sr, and Ca, and has a thickness of 1-20 nm. The average crystal grain diameter of the surface of the base material is preferably 20-300 μm.