To provide a porous body having a pH adjusting function, in using a method of producing a porous body for which the restriction about a usable glass material is less.

The method of producing a porous body includes a process for preparing a mixture including a glass powder A containing an alkali component, a powder B including at least one crystal selected from (a) a clay mineral having a layered crystal structure and (b) a zeolite, and a powder C of a water-soluble inorganic salt, where 0.05 to 3 pts.mass of the powder B and 0.2 to 4 pts.mass of the powder C are included to 1 pt.mass of the glass powder A, a process for forming a shaped body from the mixture, a process for obtaining a fired body by firing the shaped body at a temperature lower than a melting point of the water-soluble inorganic salt and equal to or higher than a softening point of the glass, and a process for obtaining a granular porous body by leaching the water-soluble inorganic salt from the fired body. The main component of the powder B is at least one crystal selected from a 1:1 type mineral, a 2:1 type mineral other than a smectite mineral, a mixed-layer type mineral, a 2:1 ribbon type mineral, and a zeolite.