FUEL CELL, CELL STACK, FUEL CELL MODULE, AND FUEL CELL DEVICE

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A fuel cell includes a solid electrolyte layer containing Zr; an intermediate layer containing CeO2 solid solution having a rare-earth element excluding Ce; an air electrode layer containing Sr, the intermediate layer and the air electrode layer being stacked in this order on one surface of the solid electrolyte layer; and a fuel electrode layer on another surface of the solid electrolyte layer which is opposite to the one surface. A value obtained by dividing a content of the rare-earth element excluding Ce by a content of Zr is equal to or less than 0.05 at a site of the solid electrolyte layer, the site being 1 μm away from an interface between the solid electrolyte layer and the intermediate layer.