Polyelectrolyte fuel cell and fuel cell sealing member to be used for such polyelectrolyte fuel cell

The present invention provides a fuel cell, even in a case where the sealing member on the anode side and the cathode side of the fuel cell sealing member between the anode and the cathode end surface forming a gap, can be effectively utilized for the electrode reaction of the reaction gas, and a simple the constitution will ensure sufficient power generation performance. At least one variable shaped seal member inner anode side and the cathode side of the fuel cell sealing member of at least one of the annular body portion and the annular main body portion of the surface of the projection portion configured.