NOVELTY - A fuel cell has a hydrogen pole separator (8) and an oxygen electrode separator (9). The pole separator has base layer formed of base material (I), layer (I) of hydrogen pole separator having MN-type crystal structure, and a layer (II) of hydrogen pole separator having M4N-type crystal structure. The electrode separator has a base layer formed of base material (II), layer (I) of oxygen electrode separator having MN-type, M2-3-type or M4N-type crystal structure, and layer (II) of oxygen electrode separator having M4N-type crystal structure.    USE - Fuel cell is used for fuel cell vehicle (claimed) such as electric vehicle and motor vehicle.    ADVANTAGE - The fuel cell has excellent durability, electric power generation performance and manufactured inexpensively.    DETAILED DESCRIPTION - A fuel cell has a hydrogen pole separator and an oxygen electrode separator. The hydrogen pole separator has base layer formed of surface nitriding treated base material (I) consisting of austenitic stainless steel, layer (I) of hydrogen pole separator having MN-type crystal structure in depth direction of base material (I), and a layer (II) of hydrogen pole separator having M4N-type crystal structure formed on base material (I). The oxygen electrode separator has a base layer formed of a surface nitriding treated base material (II) consisting of austenitic stainless steel, layer (I) of oxygen electrode separator having MN-type, M2-3-type or M4N-type crystal structure formed on depth direction of base material (II), and layer (II) of oxygen electrode separator having M4N-type crystal structure on base material (II). An INDEPENDENT CLAIM is included for manufacture of the fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional drawing of the structure of hydrogen pole separator and oxygen electrode separator arranged on both sides of single cell comprising fuel cell stack.    Single cell (2)    Solid polymer-electrolyte film (3)    Hydrogen pole (4)    Oxygen electrode (5)    Hydrogen pole separator (8)    Oxygen electrode separator (9)