PROBLEM TO BE SOLVED: To provide a prophylactic/ameliorating agent for an irritable bowel syndrome accompanying no inflammation, such as stress-related increase in bowel motility and stress-induced bowel hypersensitivity.SOLUTION: The prophylactic/ameliorating agent for the irritable bowel syndrome contains a lychee fruit or an extract thereof as an active constituent.COPYRIGHT: (C)2013,JPO&INPIT【課題】ストレス性大腸運動亢進、ストレス性大腸知覚過敏等の炎症を伴わない過敏性腸症候群の予防又は改善剤の提供。【解決手段】ライチ果実又はその抽出物を有効成分とする過敏性腸症候群の予防又は改善剤。【選択図】なし