Fuel cell membrane electrode assembly

A fuel cell membrane electrode assembly including a solid polymer electrolyte membrane, an anode provided on one surface of the solid polymer electrolyte membrane, and a cathode provided on another surface of the solid polymer electrolyte membrane, the anode including an anode catalyst layer and an anode diffusion layer having a surface size larger than that of the anode catalyst layer, the cathode including a cathode catalyst layer and a cathode diffusion layer having a surface size larger than that of the cathode catalyst layer, the anode catalyst layer and the cathode catalyst layer having different surface sizes,

• wherein a frame shaped reactant gas non-permeable area is provided between the solid polymer electrolyte membrane and the cathode diffusion layer or the anode diffusion layer, and the frame shaped reactant gas non-permeable area has an overlapped portion overlapped with an outer end of the cathode catalyst layer or the anode catalyst layer;
• and
• a reactant gas permeable area is provided at the diffusion layer of the counter electrode opposite to the electrode where the non-permeable area is provided, around the catalyst layer of the counter electrode.