An object of the present invention is to provide: a coccidiosis controlling agent which is excellent in safety, is free of problems such as side-effects, does not cause effect reduction or the like due to the acquisition of resistance to a medicament, and exhibits a high preventive effect and a high treatment effect against coccidiosis; a feed for an animal containing the anticoccidial composition; and a method for raising an animal using the coccidiosis controlling agent and the feed. In order to solve the above-mentioned problem, provided is a coccidiosis controlling agent for an animal, containing heated cashew nut shell liquid and/or cardanol.