The problem to be solved by the present invention is to provide a novel antiallergic agent comprising as an active ingredient a compound that has not been known to have an antiallergic action. The present invention provides an antiallergic agent comprising a compound represented by formula (I) or a salt thereof: wherein R1 and R2 are the same or different and each represent an alkyl group having 1 to 3 carbon atoms. m shows the integer of 0-3. n shows the integer of 1-3. ].本発明が解決すべき課題はこれまで抗アレルギー作用を有することが知られていなかった化合物を有効成分とする、新規抗アレルギー剤を提供することである。本発明は、式(I)で表わされる化合物又はその塩を含む、抗アレルギー剤を提供する:[式中、R1及びR2は同一又は異なって、炭素数1~3のアルキル基を示す。mは0~3の整数を示す。nは1~3の整数を示す。]。