NOVELTY - The membrane has a hollow-shaped inorganic fine particle (2) i.e. silica microcapsule, comprising multiple through-holes that are penetrated an outer shell that forms an internal space. An inner side and a through-hole of the inorganic fine particle are filled with an electrolyte resin (1) i.e. silica type electrolyte resin. An electrolyte layer (110) e.g. polymer electrolyte, is made to contact with the electrolyte resin in which the through-hole of the inorganic fine particle is filled, and covered a part of the outer shell and a surface of a proton-conductive material (100).    USE - Electrolytic membrane for a fuel cell that produces electric power.    ADVANTAGE - The electrolyte resin comprising a proton-conductivity is filled into the inner side of the inorganic fine particle, thus reducing expansion and contraction of the membrane by change of water content or change of temperature by the membrane. The electrolyte layer e.g. polymer electrolyte, made to contact with the electrolyte resin in which the through-hole of the inorganic fine particle is filled, and covered the part of the outer shell and the surface of the proton-conductive material, thus improving proton-conductivity of the membrane. The inner side and the through-hole of the inorganic fine particle are filled with the electrolyte resin e.g.silica type electrolyte resin, and the monomer is used as a raw material of the electrolyte resin filled with the membrane, thus making the stable inorganic fine particle chemically rigid by using the silica microcapsule as the inorganic fine particle, generating polymerization reaction in an easy manner, and improving affinity of the electrolyte layer and the silica microcapsule by using in the unit silicon type-material that comprises the silicon oxide bonds as the electrolyte layer.    DETAILED DESCRIPTION - The electrolyte layer consists of a silicon type-material that comprises multiple silicon oxide bonds in a unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of an electrolyte layer of an electrolytic membrane.    Electrolyte resin (1)    Hollow-shaped inorganic fine particle (2)    Proton-conductive material (100)    Electrolyte layer (110)