NOVELTY - A proton-conductive electrolytic membrane (10) has membranous base material (1) containing inorganic oxide and having fine through-hole (2) which penetrates between front and back of base material, and porous filler (3) which contains inorganic oxide having several micropores penetrating between front and back of base material. A functional group used as proton conduction path is provided to the microporous inner surface of the porous filler.    USE - Proton-conductive electrolytic membrane is used for fuel cell such as polymer electrolyte fuel cell, molten carbonate fuel cell, solid oxide fuel cell and direct methanol fuel cell used as power supply for household appliances, motor vehicle and mobile devices.    ADVANTAGE - The proton-conductive electrolytic membrane having excellent proton conductive performance is manufactured economically by simple process. The proton-conductive electrolytic membrane prevents fuel cell from gas permeation and swelling by fuel.    DETAILED DESCRIPTION - A proton-conductive electrolytic membrane has membranous base material containing inorganic oxide and having fine through-hole which penetrates between front and back of base material, and porous filler which contains inorganic oxide having several micropores penetrating between front and back of base material. A functional group used as proton conduction path is provided to the microporous inner surface of the porous filler. The membranous base material contains alumina. The fine through-hole of the membranous base material is formed by anodic oxidation of aluminum. The porous filler contains silica. The functional group is chosen from sulfo group, sulfino group, phosphoryl group, carboxyl group and hydroxyl group. An INDEPENDENT CLAIM is included for manufacture of proton-conductive electrolytic membrane. A raw material solution used during manufacture of proton-conductive electrolytic membrane is a solution containing metal alkoxide.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of proton-conductive electrolytic membrane.    Membranous base material (1)    Fine through-hole (2)    Porous filler (3)    Proton-conductive electrolytic membrane (10)