NOVELTY - A membrane electrode assembly has a polymer electrolyte membrane (1), an anode catalyst layer (2) and a cathode catalyst layer (3). The anode catalyst layer is arranged on a surface of the polymer electrolyte membrane. The cathode catalyst layer is arranged on another surface of the polymer electrolyte membrane. The anode catalyst layer and the cathode catalyst layer contain catalyst loaded particles and a polymer electrolyte. The cathode catalyst layer has higher catalyst concentration in a surface region than in a boundary region with the electrolyte membrane.    USE - Membrane electrode assembly for use in a polymer electrolyte fuel cell (claimed) that is utilized for a vehicle, household stationary power supply and mobile device.    ADVANTAGE - The membrane electrode assembly has excellent power generation performance. The electrode assembly is manufactured in a simple and effective manner.    DETAILED DESCRIPTION - A membrane electrode assembly has a polymer electrolyte membrane, an anode catalyst layer and a cathode catalyst layer. The anode catalyst layer is arranged on one surface of the polymer electrolyte membrane. The cathode catalyst layer is arranged on the other surface of the polymer electrolyte membrane. The anode catalyst layer and the cathode catalyst layer contain catalyst loaded particles and a polymer electrolyte. The cathode catalyst layer has higher catalyst concentration in a surface region than in a boundary region with the electrolyte membrane when measured in the thickness direction of the cathode catalyst layer. The anode catalyst layer has a high catalyst concentration in the boundary region with the electrolyte membrane than in the surface region when measured in the thickness direction of the anode catalyst layer. INDEPENDENT CLAIMS are also included for the following:    (1) a polymer electrolyte fuel cell    (2) a method for manufacturing a membrane electrode assembly.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of a fuel cell.    Polymer electrolyte membrane (1)    Anode catalyst layer (2)    Cathode catalyst layer (3)    Gas diffusion layers (4, 5)    Gas flow path (8)