PROBLEM TO BE SOLVED: To provide a dipeptidyl peptidase IV inhibitor that finds a product having a dipeptidyl peptidase IV inhibiting action from natural products having high safety, and uses it as an effective constituent.SOLUTION: The dipeptidyl peptidase IV inhibitor includes, as the effective constituent, one or more kinds of natural products selected from a group consisting of a Vitis heterophylla extract, sesame peptide, lemon balm extract, ginkgo biloba extract, yacon extract, and tilia miqueliana extract.
