The present invention provides a method for producing a diaphragm for alkaline water electrolysis use, in which the formation of macrovoids is prevented. The present invention is a method for producing a diaphragm for alkaline water electrolysis use which is provided with a porous layer, the method including a step for producing the porous layer using a composition comprising an organic polymer, inorganic particles, a compound represented by general formula (1) and a solvent. (1): R-X (In formula (1), R represents a hydrocarbon group having 6 or more carbon atoms; and X represents a hydrophilic functional group.)