An object of the present invention is to provide a feces treatment agent for colostomy, which on the assumption that characteristics required as a lubricant are shown, can maintain or improve the feces discharge properties from a colostomy pouch, inhibit the development of feces odor, and improve operativity and portability. A feces treatment agent for colostomy, in which an agent A including (1) a granular water-soluble lubricant, (2) a granular water-absorbing gelling agent, (3) sodium bicarbonate, and (4) a component including at least one selected from the group consisting of zinc oxide, limonite and zinc sulfide is contained in a water-soluble base material.