NOVELTY - A solid electrolyte is dried and mixed with purified solvent to obtain a liquid mixture. The solid electrolyte is dissolved in the solvent, and liquid mixture is set as solution. The solution is filtered, foreign material is removed and solid electrolyte dope (24) is obtained.    USE - For manufacture of solid electrolyte film used for electrode membrane composite material of fuel cell (both claimed) used as power supply for robots, toys, portable generator, field lighting equipment, flashlight, motor vehicles, household appliances and portable devices, such as mobile telephone, mobile notebook personal computer, electronic still camera, personal digital assistance, video camera, handheld game machine, mobile server, wearable personal computer and mobile display.    ADVANTAGE - The dope forms high quality solid electrolyte film having high ionic conductivity and excellent durability is manufactured continuously, economically and quickly. The electrolyte film provides electrode membrane joint component having excellent electromotive force.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) manufacture of solid electrolyte film, which involves flow spreading the solid electrolyte dope on a support and forming spread film, and peeling off and drying the spread film;    (2) solid electrolyte film manufactured by the above method;    (3) electrode membrane composite material comprising the solid electrolyte film, an anode contacted with one surface of solid electrolyte film, and a cathode contacting another surface of solid electrolyte film. The anode produces proton from hydrogen-containing substance. The cathode produces water from proton passed through solid electrolyte film, and gas; and    (4) fuel cell comprising the electrode membrane composite material, and a collector contacting the composite. The collector delivers electron of anode and cathode.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic view of dope manufacturing equipment. (Drawing includes non-English language text)    Dope manufacturing equipment (10)    Heating apparatus (18)    Filters (22,27)    Dope (24)    Film manufacturing equipment (33)