PROBLEM TO BE SOLVED: To provide a blood sugar level increase inhibitor containing a peptide prepared by hydrolyzing collagen or gelatin obtained from fish scales and/or fish bones as an active ingredient, especially a blood sugar level increase inhibitor having improving activity for hyperlipemia accompanied by diabetes mellitus and having an excellent high-blood sugar level increase inhibiting activity. SOLUTION: A peptide prepared by hydrolyzing collagen or gelatin obtained through a calcium removing treatment or the like of fish scales and/or fish bones is used as an active ingredient of a blood sugar level increase inhibitor, especially a blood sugar level increase inhibitor having improving activity for hyperlipemia accompanied by diabetes mellitus.
