To provide a planar array fuel cell in which spaces between cells can be narrowed, while suppressing short-circuiting among the cells.

In the fuel cell, membrane electrode assemblies are formed at openings provided in a substrate 14, and each membrane electrode assembly includes an electrolyte membrane 22, an anode catalyst layer 24, and a cathode catalyst layer 26. Protective layers 30a made of foam are provided on the substrate 14 between the anode catalyst layers 24 adjacent to each other, and protective layers 30b made of foam are provided on the substrate 14 between the cathode catalyst layers 26 adjacent to each other.