NOVELTY - The catalyst coated membrane comprises a phosphoric acid-based material doped electrolyte membrane (12), and a catalyst layer (14, 16) formed on a surface of the electrolyte membrane. The catalyst layer has a thickness deviation of less than or equal to 20%, and a utilization ratio of greater than or equal to 40%, and comprises a catalyst, a binder, a phosphoric acid-based material, and water. The phosphoric acid-based material has a doping concentration of 100-800 parts by weight based on 100 parts by weight of the electrolyte membrane. An amount of phosphoric acid-based material in the catalyst layer is 0.1-4 parts by weight.    USE - The catalyst coated membrane is useful in a membrane and electrode assembly for a fuel cell (claimed), which is useful in a portable electronic devices including emission-free vehicles, household power generation systems, mobile communication equipment, medical devices, military equipment and space equipment.    ADVANTAGE - The catalyst coated membrane has high proton conductivity, improves current density of the membrane and electrode assembly, and increases output energy density, performance, thermal stability and energy conversion efficiency of the fuel cell.    DETAILED DESCRIPTION - The catalyst coated membrane comprises a phosphoric acid-based material doped electrolyte membrane (12), and a catalyst layer (14, 16) formed on a surface of the electrolyte membrane. The catalyst layer has a thickness deviation of less than or equal to 20%, and a utilization ratio of greater than or equal to 40%, and comprises a catalyst, a binder, a phosphoric acid-based material, and water. The phosphoric acid-based material has a doping concentration of 100-800 parts by weight based on 100 parts by weight of the electrolyte membrane. An amount of phosphoric acid-based material in the catalyst layer is 0.1-4 parts by weight based on 1 part by weight of the catalyst. An amount of the water in the catalyst layer is 1-5 parts by weight based on 1 part by weight of the catalyst. An amount of the binder in the catalyst layer is 0.001-0.5 parts by weight based on 1 part by weight of the catalyst. A thickness ratio of the electrolyte membrane to the catalyst layer is 1:1-1:2. INDEPENDENT CLAIMS are included for:    (1) a membrane and an electrode assembly for a fuel cell;    (2) a method of manufacturing a membrane and electrode assembly for a fuel cell; and    (3) a fuel cell.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a stack structure of a membrane and electrode assembly.    Membrane and electrode assembly (10)    Electrolyte membrane (12)    Catalyst layer (14, 16)    Electrode supports. (18, 20)