NOVELTY - A proton conductive electrolyte film contains a proton-conductive polymer packed in the pores of an inorganic porous film. The proton-conductive polymer is obtained by copolymerizing mixture (M) having at least a compound (a) having one or more sulfonic acid groups and one or more ethylenically unsaturated bonds per molecule, a compound (b) having one or more phosphoric acid groups and one or more ethylenically unsaturated bonds per molecule, and specific silicon compound (c).    USE - For polymer electrolyte fuel cell (claimed) used as power supply for personal digital assistance.    ADVANTAGE - The proton conductive electrolyte film has high proton conductivity and low methanol permeability.    DETAILED DESCRIPTION - A proton conductive electrolyte film contains a proton-conductive polymer packed in the pores of an inorganic porous film. The proton-conductive polymer is obtained by copolymerizing mixture (M) having at least a compound (a) having one or more sulfonic acid groups and one or more ethylenically unsaturated bonds per molecule, a compound (b) having one or more phosphoric acid groups and one or more ethylenically unsaturated bonds per molecule, and compound (c) of formula: (R1O)n-Si-R2m.    R1=4C or less alkyl group;    R2=copolymerizable organic group;    m,n=1-3;and    m+n=4.    INDEPENDENT CLAIMS are included for the following:    (1) polymer electrolyte fuel cell, which has the proton conductive electrolyte film (1) as electrolyte interposed between cathode pole (3) and anode pole (2); and    (2) manufacture of proton conductive electrolyte film, which involves forming a layer using a dispersion liquid containing inorganic particles and organic particles, baking to form inorganic porous membrane, filling mixture (M) in pores of porous membrane, and polymerizing.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic view of direct methanol-type solid polymeric fuel cell.    Electrolyte film (1)    Anode pole (2)    Cathode pole (3)    External circuit (4)