An object to be achieved by the present invention is to provide a novel antiallergic agent using, as an active ingredient, a compound that has heretofore not been known to have an antiallergic action. The present invention provides an antiallergic agent, including a compound represented by the formula (I) or a salt thereof:where R1 and R2, which are identical to or different from each other, each represent an alkyl group having 1 to 3 carbon atoms, m represents an integer of from 0 to 3, and n represents an integer of from 1 to 3.
