PROBLEM TO BE SOLVED: To provide an amylase-activity-inhibiting composition that contains a chito-oligosaccharide having amylase inhibitory activity as an active ingredient, or contains the chito-oligosaccharide and grape seed extract as active ingredients, thereby exhibiting a high glycolysis-suppressing effect, and an anti-obesity agent containing the amylase-activity-inhibiting composition.SOLUTION: The present invention provides an amylase-activity-inhibiting composition that contains a chito-oligosaccharide as an active ingredient.SELECTED DRAWING: None【課題】アミラーゼ阻害活性を有するキトオリゴ糖を有効成分として含有する、又は、キトオリゴ糖およびブドウ種子抽出物を有効成分として含有することにより、糖分解抑制効能に優れたアミラーゼ活性阻害用組成物およびこれを含む抗肥満剤の提供。【解決手段】キトオリゴ糖を有効成分として含有するアミラーゼ活性阻害用組成物。【選択図】なし