PROBLEM TO BE SOLVED: To provide a TRPA1 active inhibitor effective for the reduction of pain caused by irritation.SOLUTION: A TRPA1 active inhibitor includes a compound expressed by formula (1) [wherein, R1 to R5 and R8 denote a hydrogen atom or a methyl group, independently and R6 or R7 denotes hydrogen atom, a hydroxyl group or a methyl group (provided that any one of R6 or R7 is a hydroxyl group)] as an active ingredient.COPYRIGHT: (C)2014,JPO&INPIT【課題】刺激による痛みの軽減に有効なTRPA1活性抑制剤の提供。【解決手段】下記式(1):【化1】〔式中、R1~R5及びR8は独立して水素原又はメチル基を示し、R6及びR7は水素原子、水酸基又はメチル基を示す(但し、R6及びR7のいずれか一方は水酸基である)。〕で表される化合物を有効成分とするTRPA1活性抑制剤。【選択図】なし