PROBLEM TO BE SOLVED: To provide a novel α-glucosidase activity inhibitor, and a novel agent for inhibiting the increase in blood glucose level.SOLUTION: The present invention provides α-glucosidase activity inhibitors comprising urolithins.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】新規なα-グルコシダーゼ活性阻害剤の提供、および、新規な血糖値上昇抑制剤の提供。【解決手段】ウロリチン類を含有するα-グルコシダーゼ活性阻害剤。【選択図】図1