It is intended to provide a pharmaceutical composition, a food or drink, or a feed which has an effect on the prevention and/or treatment of an intestinal disease such as ulcerative colitis, Crohn's disease or irritable bowel syndrome. A preferred embodiment is the pharmaceutical composition, food or drink, or feed which contains lactoperoxidase as an active ingredient and has an effect on the prevention and/or treatment of an intestinal disease, wherein the intestinal disease is at least one disease selected from ulcerative colitis, Crohn's disease and irritable bowel syndrome.
