Fuente: WIPO "milk" An object is to provide an anti-stress composition that can be administered for a long period of time and is highly safe. Provided is an anti-stress composition including Lactobacillus helveticus as an active ingredient. The stress may be mental stress. Furthermore, the composition may be used for treatment or prevention of anxiety disorder, anthropophobia, a decline in sociality, or adjustment disorder. Furthermore, the Lactobacillus helveticus may be Lactobacillus helveticus NITE BP-01671. Furthermore, the composition may be a pharmaceutical composition or a food or drink composition.