NOVELTY - A dope (24) containing solid electrolyte and a low-boiling-point organic solvent is flow-spread on a support (111) from a spread die (81), and a spread film (24a) is formed. The spread film is stripped off from the support, and dried to obtain a solid-electrolyte film. The film (410) is contacted with a liquid which is a poor solvent of the solid electrolyte, and the film is softened by flattening process.    USE - For manufacturing solid-electrolyte films for electrode-membrane composites used in fuel cells (all claimed), such as direct methanol fuel cells, useful as energy source for mobile phones, mobile notebook personal computers, electronic still cameras, personal digital assistants, video cameras, handheld game machines, mobile servers, mobile displays, portable generators, field lighting-equipment devices, flashlights, electrically-driven bicycles, robots, household appliances, and toys, and for redox flow batteries, lithium cells, display elements, electrode chemical sensors, signal-transmission media, capacitors, electrodialysis, electrolysis, gel actuators, salt electrolysis films, and proton exchange resins.    ADVANTAGE - The method enables continuous manufacture of solid-electrolyte films having excellent quality, ionic conductivity, and planar property. The obtained solid-electrolyte film provides fuel cells having excellent electromotive force.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) manufacturing equipment (33b) of solid-electrolyte film, equipped with a spread-film forming apparatus, a tearing-off apparatus, a drier, and a liquid contactor;    (2) solid-electrolyte film;    (3) electrode-membrane composite comprising an anode for generating a proton from the hydrogen-containing substance, a cathode for synthesizing water from the proton and a gas, and the solid-electrolyte film with one surface contacting the anode and the other contacting the cathode; and    (4) fuel cell comprising the electrode-membrane composite and a collector contacting the electrode. The collector delivers the electron of the anode and cathode.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic drawing of film manufacturing equipment. (Drawing includes non-English language text).    Dope (24)    Spread film (24a)    Film manufacturing equipment (33b)    Tenter (64)    Spread die (81)    Support (111)    Film (410)