One embodiment shows a method for producing porous cellulose particles, including:



(a) dissolving cellulose diacetate into a solvent to prepare a cellulose diacetate solution;
(b) dispersing the cellulose diacetate solution into a medium immiscible with the cellulose diacetate solution to obtain a dispersed system;
(c) cooling the dispersed system;
(d) adding a poor solvent to the cooled dispersed system to precipitate cellulose diacetate particles; and
(e) saponifying the cellulose diacetate particles.