A pest control agent according to the present invention contains a compound of formula (I) (in the formula, Ar represents a substituted or unsubstituted C6-10 aryl group, R1 represents a cyano group or a substituted or unsubstituted thiocarbamoyl group, R2 represents a hydrogen atom, a halogeno group, a substituted or unsubstituted C1-6 alkyl group, a hydroxyl group, or a substituted or unsubstituted C1-6 alkoxy group, R3 represents a hydrogen atom, a halogeno group, a substituted or unsubstituted C1-6 alkyl group, or the like, and Q represents a cyclic amino group) or a salt thereof.
