PROBLEM TO BE SOLVED: To provide an anti-norovirus agent which has an excellent anti-norovirus effect and is light in color and does not easily impair the appearance of an object. SOLUTION: An anti-norovirus agent containing 0.005% by mass or more of apple polyphenol. [Selection diagram] None【課題】優れた抗ノロウイルス効果を有しており、かつ、淡色であり対象物の外観を損ねにくい、抗ノロウイルス剤の提供。【解決手段】リンゴポリフェノールを0.005質量%以上含む、抗ノロウイルス剤。【選択図】なし