<;P>;PROBLEM TO BE SOLVED: To provide an immunomodulator which can be continuously taken in by animals, has no fear of side effects, and has high safety and a method of modulating the immunity of animals by using this immunomodulator. <;P>;SOLUTION: The immunomodulator for animals comprises a bacterial cell of a microbe belonging to the genus Aureobasidium, above all, the immunomodulator for animals comprises a bacterial cell of the microbe and diatomaceous earth. <;P>;COPYRIGHT: (C)2008,JPO&INPIT