A parasite-control or parasiticide agent that exhibis excellent effects of controlling or expelling parasites, particularly endoparasites and that can be used safely contains at least one selected from the group consisting of compounds represented by formula (I) and salts thereof as an active ingredient thereof. (In the formula (I), Cy represents a heteroaryl group or the like, X represents a halogeno group or the like, n is an integer of 0 to 5, in the case where n is 2 or more, X is identical or different, R 1 represents an unsubstituted or substituted C1-6 alkyl group or the like, A represents a nitrogen atom or the like, R 2 , R 3 , and R 4 each independently represents a hydrogen atom, an unsubstituted or substituted C1-6 alkyl group, or the like, and R 5 represents an unsubstituted or substituted C6-10 aryl group, unsubstituted or substituted heteroaryl group, or the like.)
