NOVELTY - A catalyst ink is coated on base material, to form coating film which is dried, to form electrode catalyst layer (2,3). The base material is arranged on both surfaces of polymer electrolyte membrane (1). Then, surface on opposite side to electrode catalyst layer formation surface of base material is contacted with another component (23) by hot-pressing and after which electrode catalyst layer is joined on both surfaces of polymer electrolyte membrane. Thus, manufacture of membrane electrode assembly (12) is performed.    USE - Manufacture of membrane electrode assembly used for polymer electrolyte fuel cell (both claimed), domestic fuel cell system and electric vehicle fuel cell.    ADVANTAGE - The method provides favorable membrane electrode assembly, and the polymer electrolyte fuel cell comprising the membrane electrode assembly has favorable power generation catalyst.    DETAILED DESCRIPTION - A catalyst ink containing electron-conducting substance, solid polymer electrolyte and solvent which supports catalyst substance is coated on a base material, to form a coating film which is dried, to form an electrode catalyst layer. The base material is arranged on both surfaces of a polymer electrolyte membrane, such that electrode catalyst layer and polymer electrolyte membrane are opposite to each other. Then, the surface on the opposite side to the electrode catalyst layer formation surface of base material is contacted with another component by hot-pressing and after which the electrode catalyst layer is joined on both surfaces of polymer electrolyte membrane. The friction coefficient with respect to polymer electrolyte membrane surface of electrode catalyst layer surface on the base material is larger than the friction coefficient with respect to surface of other component of surface on the opposite side to the electrode catalyst layer formation surface of base material. Thus, manufacture of membrane electrode assembly is performed. An INDEPENDENT CLAIM is included for polymer electrolyte fuel cell.    DESCRIPTION OF DRAWING(S) - The drawings show schematic view explaining manufacture of membrane electrode assembly.    Polymer electrolyte membrane (1)    Electrode catalyst layers (2,3)    Membrane electrode assembly (12)    Base material film (22)    Other component (23)