The present invention provides an orally ingestible composition and a method for regulating an autonomic nervous activity. In particular, the present invention provides an orally ingestible composition capable of suppressing an increase in a sympathetic nervous activity, and an orally ingestible composition capable of promoting a parasympathetic nervous activity. The present invention is a composition for regulating an autonomic nervous activity, comprising, as an active ingredient, Tyr-Pro or a salt thereof.