The present invention provides a hypoglycemic inhibitor having a serine protease inhibitory action, which is a novel therapeutic or preventive agent for diabetes. A compound represented by the following general formula (I), or a pharmaceutically acceptable salt thereof. (In the formula, each symbol is as described in the specification.)本発明は、新規な糖尿病の治療または予防薬であるセリンプロテアーゼ阻害作用を有する血糖上昇抑制剤を提供する。下記一般式(I)で示される化合物、またはその医薬的に許容しうる塩。(式中、各記号は明細書中に記載の通りである。)