NOVELTY - A membrane electrode assembly has solid polymer electrolyte membrane (1), pair of electrode catalyst layer (2,3) which clamps the solid polymer electrolyte membrane, and polymer electrolyte fuel cell containing pair of separator (10) provided with pair of gas diffusion layer and gas distribution path which clamps the electrode catalyst layer of pair. The pair of electrode catalyst layer contains composite catalyst particles containing polymer electrolyte, catalyst substance, and electroconductive substance.    USE - Membrane electrode assembly is used for manufacturing polymer electrolyte fuel cell (all claimed).    ADVANTAGE - The polymer electrolyte fuel cell efficiently manufactured using the membrane electrode assembly has improved proton conductivity and gas diffusion property.    DETAILED DESCRIPTION - A membrane electrode assembly has solid polymer electrolyte membrane, pair of electrode catalyst layer which clamps the solid polymer electrolyte membrane, and polymer electrolyte fuel cell containing pair of separator provided with pair of gas diffusion layer and gas distribution path which clamps the electrode catalyst layer of pair. The pair of electrode catalyst layer contains composite catalyst particles containing polymer electrolyte, catalyst substance, and electroconductive substance. The surface direction of electrode catalyst layer has area whose content rate of polymer electrolyte in composite catalyst particles is differing. INDEPENDENT CLAIMS are included for the following:    (1) polymer electrolyte fuel cell, which contains membrane electrode assembly;    (2) manufacture of membrane electrode assembly, which involves producing several catalyst ink which mixes polymer electrolyte, catalyst substance, electro-conductive substance, and solvent, obtaining several granulated material, classifying obtained several granulated material from catalyst ink by granulating several composite catalyst particles, applying composite catalyst particles in the surface direction of electrode catalyst layer, and forming area whose content rate of polymer electrolyte in the composite catalyst particles differ; and    (3) manufacture of polymer electrolyte fuel cell, which involves clamping membrane electrode assembly in a pair of gas diffusion layer, and further clamping pair of gas diffusion layer with pair of separator.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of membrane electrode assembly. (Drawing includes non-English language text)    Solid polymer electrolyte membrane (1)    Electrode catalyst layer (2,3)    Air electrode (6)    Fuel electrode (7)    Separator (10)