NOVELTY - A membrane electrode assembly (13) has anode (11), cathode (12) and electrolytic membrane (10) provides between anode and cathode. The anode includes anode catalyst layer (16) and anode diffused layer (17). The anode catalyst layer contains anode catalyst supported by electroconductive carbon particles (a1) and polymer electrolyte (a2). The cathode includes cathode catalyst layer (18) and cathode diffused layer (19). The cathode catalyst layer contains cathode catalyst supported by electroconductive carbon particles (b1) and polymer electrolyte (b2).    USE - Membrane electrode assembly is used for direct-oxidation fuel cell (claimed). Uses include but are not limited to motor vehicle, electric scooter, mobile telephone, notebook personal computer and digital still camera.    ADVANTAGE - The membrane electrode assembly has excellent diffusibility of fuel, exhaustability of carbon dioxide, proton conductivity, power generation characteristics, durability, and oxidation and reduction performance.    DETAILED DESCRIPTION - A membrane electrode assembly has anode, cathode and electrolytic membrane provides between anode and cathode. The anode includes anode catalyst layer provided on main surface of the electrolytic membrane, and anode diffused layer laminated on the anode catalyst layer. The anode catalyst layer contains anode catalyst supported by electroconductive carbon particles (a1) and polymer electrolyte (a2). The cathode includes cathode catalyst layer provided on other main surface of the electrolytic membrane, and cathode diffused layer laminated on the cathode catalyst layer. The cathode catalyst layer contains cathode catalyst supported by electroconductive carbon particles (b1) and polymer electrolyte (b2). The weight ratio of the polymer electrolyte (a2) is larger than weight ratio of the polymer electrolyte (b2). An INDEPENDENT CLAIM is included for direct-oxidation fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows longitudinal cross-sectional view of unit cell.    Unit (1)    Electrolytic membrane (10)    Anode (11)    Cathode (12)    Membrane electrode assembly (13)    Anode catalyst layer (16)    Anode diffused layer (17)    Cathode catalyst layer (18)    Cathode diffused layer (19)