PROBLEM TO BE SOLVED: To provide a novel hyaluronidase activity inhibitor.SOLUTION: A hyaluronidase inhibitor comprises the component of rice koji obtained by propagating at least one selected from Aspergillus kawachii, Aspergillus awamori and Aspergillus oryzae.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】新規のヒアルロニダーゼ活性阻害剤を提供する。【解決手段】白麹菌(Aspergillus kawachii)、黒麹菌(Aspergillus awamori)及び黄麹菌(Aspergillus oryzae)から選択される少なくとも1種を繁殖させた米麹の成分を含有するヒアルロニダーゼ阻害剤。【選択図】図1