A multilayer inorganic porous membrane consisting of a monolayer or multilayer porous support having at least one surface integrally formed thereon with a porous thin layer having an average pore size less than that of the porous support, wherein a maximum pore size in the support surface is defined to be from 1 to 250 times an average pore size of the thin layer. The multilayer porous membrane is superior in preventing the occurrence of pin holes and cracks therein thereby enhancing precision of the filtration and separation.