The fuel cell and fuel cell

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PROBLEM TO BE SOLVED : To provide a cell of a fuel cell capable of approaching a coefficient of the thermal expansion of a supporter to that of an solid electrolyte and suppressing the characteristic deterioration of the solid electrolyte caused by element diffusion from the supporter, and to provide the fuel cell. SOLUTION : The cell 3 of the fuel cell is formed by installing in order a fuel electrode 13e, the solid electrolyte 13b, and an air electrode 13c on the surface of the supporter 13a having an iron group element and/or an oxide of the iron group element as a main component, and when the oxide conversion amount of a rare earth element of the supporter 13a is represented by Re1, the oxide conversion amount of the rare earth element of a supporter side fuel electrode layer 13e2 formed on the supporter 13a side of the fuel electrode 13e is represented by Re2, the oxide conversion amount of the rare earth element in the electrolyte side fuel electrode layer 3e2 formed on the solid electrolyte 13b side of the fuel electrode 13e is represented by Re3, and oxide conversion amount of the the rare earth element of the solid electrolyte 13b is represented by Re4, relations of Re1>Re4, Re2>Re3, and Re4>Re3 are satisfied. COPYRIGHT : (C)2004, JPO