This TRPA1 activity inhibitor contains a compound represented by formula (I) wherein R1, R2, R3 and R4 each independently represent a hydrogen atom or a methyl group, and R5, R6, R7 and R8 each independently represent a hydrogen atom, a methyl group or —;O—;R9—;OH (in the formula, R9 represents an alkylene group optionally having a substituent group), provided that at least one group of R5, R6, R7 and R8 is —;O—;R9—;OH.