This composition, which contains, as active ingredients, microbial cells of a lactobacilli belonging to Lactobacillus paracasei, a cultured product or fermented product thereof, or a polysaccharide produced by the same, is effective for preventing or alleviating type IV allergy. In particular, this composition can be used as food, medication, animal food, and cosmetics for preventing or alleviating contact dermatitis.
