PROBLEM TO BE SOLVED: To provide an inhibitor of activation of TRPV4 effective for preventing or improving overactive bladder.SOLUTION: An inhibitor of activation of TRPV4 includes ferulic acid or salt thereof as an active ingredient.COPYRIGHT: (C)2014,JPO&INPIT【課題】過活動膀胱の予防又は改善に有効なTRPV4活性抑制剤の提供。【解決手段】フェルラ酸は又はその塩を有効成分とするTRPV4活性抑制剤。【選択図】なし