<；P>；PROBLEM TO BE SOLVED: To provide an immunostimulator including a specific lactic acid bacterium which is significantly excellent in the promotion of immunizing power of a living body, and to provide an immunostimulating feed composition prepared by blending the same. <；P>；SOLUTION: The immunostimulator includes a lactic acid bacterium derived from Lactobacillus sakei HS1 (FERM P-17617) strain, or its processed substance. The immunostimulating composition contains 0.1-10 mg% of the immunostimulator. The immunostimulator is suitably contained in a feed composition. <；P>；COPYRIGHT: (C)2011,JPO&INPIT
