NOVELTY - The polymeric electrolyte film contains proton exchange resin (in mass%) (30-99.9) and polyphenylene ether resin (0.01-70). The proton exchange resin and polyphenylene ether resin are mutually phase-separated. The polyphenylene ether resin is dispersed and oriented perpendicularly in film-thickness direction of the polymeric electrolyte film, in filament form, fibrous form and/or acicular form.    USE - For polyelectrolyte laminated film for film electrode assembly used for polymer electrolyte fuel cell (all claimed).    ADVANTAGE - The polymeric electrolyte film has excellent chemical stability, mechanical strength, heat resistance, storage stability and dryness-and-moisture dimensional stability. The polymeric electrolyte film provides fuel cell having excellent durability and operatability at high temperature and low-humidity conditions. Generation of tear or pinhole in the polymeric electrolyte film, is prevented.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) polyelectrolyte laminated film comprising a laminate of two or more layers of films having proton exchange resin. At least one layer of film is a polymeric electrolyte film;    (2) manufacturing method of polymeric electrolyte film. The method involves mixing proton exchange resin (30-99.9) and polyphenylene ether resin (0.01-70) in a fluid medium to obtain a cast liquid. The obtained cast liquid is sprayed on a support to obtain a polymeric electrolyte film;    (3) film electrode assembly consisting of the polymeric electrolyte film or polyelectrolyte laminated film provided between anode and cathode. The anode consists of anode catalyst layer, and has proton conductivity. The cathode consists of cathode catalyst layer, and has proton conductivity; and    (4) polymer electrolyte fuel cell containing the above film electrode assembly. The anode and cathode are mutually bound through an electronic conductive material which is positioned at the outer side of polymeric electrolyte film or polyelectrolyte laminated film.