Patent ID: 7097926

Claim:
A solid polymer electrolyte membrane for use in a fuel cell comprising a base film and a moisture-proof layer adhered only to a sealing frame, and to an outer edge portion of said base film and to a part of a non-electricity-generating region of said base film so as to prevent said solid polymer electrolyte membrane from expanding, shrinking, and creasing owing to moisture in air, wherein an electricity-generating region of said film is sandwiched between an anode and a cathode of the fuel cell, wherein said non-electricity-generating region of said base film is not sandwiched between the anode and the cathode, and said moisture-proof layer is not disposed on any part of the electricity-generating region of said base film, and wherein said non-electricity-generating region is sandwiched between a pair of said sealing frames, said moisture-proof layer being disposed between said non-electricity-generating region and each of said sealing frames.