NOVELTY - An inorganic porous electrolytic membrane (10) is interposed between an anode (21) and a cathode (22) in a continuously electric power generatable fuel cell by supplying a gas oxidizing agent to cathode and supplying hydrogen gas to anode. The inorganic porous electrolytic membrane contains an inorganic electrolyte material having porous structure in which a pore penetrates substantially along film-thickness direction, and is mutually substantially parallel and aligned. The pore has diameter of nanometric size. The outermost layer portion of the pore contains crystal water.    USE - Inorganic porous electrolytic membrane is used for fuel cell such as polymer electrolyte fuel cell and direct methanol fuel cell for electric vehicle.    ADVANTAGE - The fuel cell formed using the inorganic porous electrolytic membrane has high proton conductivity.    DETAILED DESCRIPTION - An inorganic porous electrolytic membrane is interposed between an anode and a cathode in a continuously electric power generatable fuel cell by supplying a gas oxidizing agent to the cathode and supplying hydrogen gas, hydrocarbon gas or liquid organic fuel to the anode. The inorganic porous electrolytic membrane contains an inorganic electrolyte material having porous structure in which a pore penetrates substantially along a film-thickness direction, and is mutually substantially parallel and aligned. The pore has diameter of nanometric size. The outermost layer portion of the pore contains crystal water. The crystal water is coordinated water, anion water, lattice water, water contained in acid hydrate and/or crystal water of zeolite. The inorganic material is alumina, silica, zirconia, titania and/or ceria. The inorganic material is filled in a pore having ultra-fine thin hole. The functional group such as hydroxyl group, functional material containing carbon and hydrogen, functional material containing nitrogen and hydrogen or functional material containing sulfur and hydrogen modifies the surface of the ultra-fine thin hole of organic material.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of the fuel cell. (Drawing includes non-English language text)    Inorganic porous electrolytic membrane (10)    Anode (21)    Cathode (22)    Separators (31,32)    Fuel flow path (311)