NOVELTY - A negative ion-exchanging film comprises polymer containing repeating unit (1-1) and/or (2-2) as constitutional components.    USE - The anion-exchanging film is suitable for desalting, treating, filtering, ion-exchanging, condensing, separating, reacting and purifying aqueous solution containing ionic substances, ion charge fine particles, coloring material, radiation material, polymer electrolyte, amino acid and/or protein. The anion-exchanging film is suitable for electrodialysis, electrical deionizing method and treating discharged gas. The anion-exchanging film is useful for producing sea water-condensed salt, brackish water, low-chlorine ion caustic soda solution, condensing of Glauber's salt, Glauber's salt-zinc sulfate, sodium sulfite, a desalted whey-protein, salt-decreased soy bean source, purification of sugar solution, electric fermentation, removal of inorganic acids and inorganic salts from amino acids, condensation, removal of metal ion, removal of radiative ion, producing of acid and alkali, double decomposition reaction, bath controlling of electrodeposition coating bath, electrical deionizing, desulfurizing from discharged gas, barrier film for battery, ion-exchanging film for fuel battery, ion-exchanging filtering material, synthetic catalyst, deodorizing antibacterial film.    ADVANTAGE - The anion-exchanging film has good thermoresistance, chemical stability, anti-oxidizing properties and holds the anion-exchanging function even under high temperatures, in oxidizing atmosphere, high-concentrated solution. The anion-exchanging film only slightly elutes from resin, has good reaction speed, low content of reinforcing agent and good flexibility.    DETAILED DESCRIPTION - A negative ion-exchanging film comprises polymer containing repeating unit of formula (1) and/or (2) as constitutional components.    A = 3-8C straight chain, branched alkylene or 4-8C alkoxymethylene;    R1, R2, R3 = H, up to 6C alkyl or alkanol.    INDEPENDENT CLAIMS are also included for an anion-exchanging film which is prepared by laminating the anion exchanging film defined above and a positive ion-exchanging film; an anion-exchanging film which contains continuous phase consisting of cation-exchanger and a continuous phase consisting of the anion-exchanger, containing repeating unit (1) and/or (2) as constitutional components; an anion-exchanging film which contains a continuous phase consisting of porous carrier material and a continuous phase which comprises anion-exchanging film containing repeating unit (1) and/or (2) as constitutional components; an anion-exchanging film which is prepared by laminating an anion-exchanging film, consisting of polymer containing repeating unit (1) as constitutional component, with anion-exchanging film, consisting of polymer containing repeating unit (2) as constitutional component; an anion-exchanging film which is a crosslinking anion-exchanger of formula (3) containing 5-99 mol % of constituting unit, P and 0.1-50 mol % of constituting unit, Q; preparation of the anion-exchanging film which comprises polymerizing solution containing monomer of formula (4) in the presence of a polymerization initiator into film form and, if necessary, converting into anion-exchanging group; electrodialysis method and its equipment; and an electrical deionizing equipment.    Z = Cl, Br, I, OH, tosyl, primary to tertiary amine or ammonium group-NR1R2R3;    R1, R2, R3 = H, up to 6C alkyl or alkanol.