Fuel cell and method for manufacturing same

The purpose of the present invention is to suppress a decrease in output power due to foreign matter present on a substrate when forming a thin-film solid electrolyte layer, increase the yield when the area of a fuel cell is increased, and reduce the cost of a fuel cell. In the fuel cell, a membrane electrode assembly comprising a lower electrode layer, a first solid electrolyte layer, a second solid electrolyte layer, and an upper electrode layer is formed on a support substrate, and the interface between the first solid electrolyte layer and the second solid electrolyte layer is flatter than the interface between the lower electrode layer and the solid electrolyte layer. The second solid electrolyte layer has a film thickness such that a leakage current between the first solid electrolyte layer and the second solid electrolyte layer is less than an allowable value even when an output voltage of the fuel cell is generated (fig. 5). 本发明的目的在于，抑制在形成薄膜固体电解质层时在基底存在的异物所导致的输出电力的降低，提高使燃料电池单元的面积增加的情况下的成品率，降低燃料电池的成本。本