NOVELTY - A fuel cell membrane electrode assembly has an anode, a cathode, and an electrolytic membrane. The anode includes an anode catalyst layer (16) and an anode diffused layer. The cathode includes a cathode catalyst layer (18) and a cathode diffused layer. At least one of the anode diffused layer and the cathode diffused layer contains an electroconductive porous base material, a porous composite layer (17b,19b) and a modified layer (17c,19c). The porous composite layer includes an electroconductive carbon material and a primary water-repellent resin material.    USE - Fuel cell membrane electrode assembly is used for fuel cell (claimed). Uses include but are not limited to portable power supply for medical machine, portable small electronic devices, e.g. mobile telephone, notebook personal computer, digital still camera, engine generator, electric scooter, motor vehicles, etc.    ADVANTAGE - The fuel cell membrane electrode assembly has excellent power generation characteristics and durability. The interface bondability with at least one of porous composite layer, anode catalyst layer, and cathode catalyst layer is improved without reducing water-repellent property of porous composite layer.    DETAILED DESCRIPTION - A fuel cell membrane electrode assembly has an anode, a cathode, and an electrolytic membrane between the anode and the cathode. The anode includes an anode catalyst layer arranged at one main surface of the electrolytic membrane, and an anode diffused layer laminated on the anode catalyst layer. The cathode includes a cathode catalyst layer arranged at the other main surface of the electrolytic membrane, and a cathode diffused layer laminated on the cathode catalyst layer. At least one of the anode diffused layer and the cathode diffused layer contains an electroconductive porous base material, a porous composite layer arranged at the cathode catalyst layer side of the porous base material, and a modified layer arranged at the cathode catalyst layer side of the porous composite layer. The porous composite layer includes an electroconductive carbon material and a primary water-repellent resin material. The modified layer includes an acicular secondary water-repellent resin material. An INDEPENDENT CLAIM is included for fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of anode catalyst layer or cathode catalyst layer.    Anode catalyst layer (16)    Porous composite layer (17b,19b)    Modified layer (17c,19c)    Cathode catalyst layer (18)