the present invention provides an animal ectoparasite - controlling agent and a method for preventing or treating infection in animals caused by parasites by using the controlling agent . an animal ectoparasite - controlling agent exhibiting excellent insecticidal activity , and a method for preventing or treating infection in animals caused by parasites by using the controlling agent are obtained by using a compound having a pyrazole ring at the 4 - position of the piperidine ring as an active ingredient .