A polymer electrolyte fuel cell comprising a membrane-form polymer electrolyte, a cathode disposed on one side of the polymer electrolyte, and an anode disposed on the other side of the polymer electrolyte, wherein the cathode comprises a catalyst and an ion exchange resin, and the ion exchange resin is made of a polymer comprising the following segments A and segments B:Segments A: segments made of a polymer having sulfonic acid groups; andSegments B: segments made of a fluoropolymer having substantially no ion exchange groups.