A porous formed article which comprises an organic polymer resin and an inorganic ion absorbing material, and has communicating holes opening at an outer surface, wherein it has interstices in the interior of a fibril forming a communicating hole, at least a part of said interstices opens at the surface of the fibril, and the inorganic ion absorbing material is carried on the outer surface of said fibril and on the surface of inner interstices.