A PEPTIDE COMPOUND HAVING A DIPEPTIDYL PEPTIDASE-IV (DPPIV) INHIBITORY ACTIVITY OR A COMPOSITION CONTAINING THE PEPTIDE COMPOUND THAT CAN MAKE A CONTRIBUTION TO THE PREVENTION OF THE ONSET OF PATHOLOGY OR THE PROGRESSION IN DIABETES MELLITUS PATIENTS OR THOSE AT RISK OF DIABETES MELLITUS CAN BE PROVIDED ACCORDING TO THE PRESENT INVENTION BY A SIMPLE METHOD USING, AS A RAW MATERIAL, MILT OF A FISHERY PRODUCT, WHICH HAS BEEN EATEN FOR AGES AND HAS HIGH SAFETY. IN THE PRESENT INVENTION, A PEPTIDE COMPOUND HAVING A PEPTIDYL PEPTIDASE-IV (DPPIV) INHIBITORY ACTIVITY OBTAINED IN A HYDROLYSATE OF A MILT PROTEIN SOURCE OBTAINED FROM A FISHERY PRODUCT IS USED AS AN ACTIVE COMPONENT OF A COMPOSITION FOR INHIBITING DPPIV. FIGURE 2
