an electrolyte membrane - electrode assembly is provided with : a solid polymer electrolyte membrane ; and an anode - side electrode and a cathode - side electrode that sandwich the solid polymer electrolyte membrane . the cathode - side electrode has smaller planar dimensions than the anode - side electrode . in the electrolyte membrane - electrode assembly , a resin frame member is provided around the outer periphery of the solid polymer electrolyte membrane . the resin frame member is bonded to the cathode - side electrode by having only the outer peripheral portion of the cathode - side electrode being impregnated with the inner peripheral portion of the resin frame member .