NOVELTY - The polymeric electrolyte film (14) comprises a composition containing fluororesin, and is clamped between an air electrode (18) and fuel electrode (13). The fluororesin composition contains fluororesin repeating units as trunk polymer substituted with adhesive property hydrophilic modified substance. The trunk polymer further comprises modified fluororesin as branch polymer.    USE - For polymer electrolyte fuel cells (claimed), for motor vehicles and electric power generators.    ADVANTAGE - The polymer electrolytic film using the fluororesin is easily molded. The obtained laminate has high adhesivity and is easy to handle. Since the film does not contain inorganic particles, the film has high strength. Ionic conductivity is changed with respect to the amount of plasticizer in the formation slurry.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) manufacture of polymer electrolyte film, which involves adding a solvent containing dimethyl formamide, dimethyl acetamide or N-methyl pyrrolidone to fluororesin and modified fluororesin, to form a slurry. The slurry is applied on a peeling liner (20) and dried to form a coated article. The solvent is removed to form a sheet article which is peeled from the liner, to form a sheet-like polymeric electrolyte film;    (2) manufacture of electrode-electrolyte laminate (19), which involves applying a slurry of a solvent containing dimethyl formamide, dimethyl acetamide or N-methyl pyrrolidone, and fluororesin and modified fluororesin, on the catalytic reaction layer side surface of a fuel electrode or air electrode, on the collector layer (11,16) or catalytic reaction layer (12,17). The applied slurry is dried to form a film from which solvent is removed to form the polymeric electrolyte film; and    (3) polymer electrolyte fuel cell which has the electrode-electrolyte laminate.    DESCRIPTION OF DRAWING(S) - The figure shows the single cell of a polymer electrolyte fuel cell. (Drawing includes non-English language text.)    polymer electrolyte fuel cell (10)    collector layers (11,16)    catalytic reaction layers (12,17)    fuel electrode (13)    polymeric electrolyte film (14)    air electrode (18)    electrode-electrolyte laminate (19)    peeling liner (20)