A TRPA1 activity inhibitor comprising a compound represented by the formula (I). [Wherein, R 1 , R 2 , R 3 and R 4 are each independently a hydrogen atom or a methyl group, and R 5 , R 6 , R 7 and R 8 are each independently a hydrogen atom, a methyl group or —O —R 9 —OH (wherein R 9 represents an alkylene group which may have a substituent). Provided that at least one group of R 5 , R 6 , R 7 and R 8 is —O—R 9 —OH.式(I)で表される化合物を含有するTRPA1の活性抑制剤。〔式中、R1、R2、R3及びR4はそれぞれ独立して水素原子又はメチル基、R5、R6、R7及びR8はそれぞれ独立して水素原子、メチル基又は-O-R9-OH(式中、R9は置換基を有していてもよいアルキレン基を示す)を示す。ただし、R5、R6、R7及びR8のうちの少なくとも1つの基は-O-R9-OHである〕