PROBLEM TO BE SOLVED: To provide a controlling agent for hemiptera pests such as Aleyrodes sp. and Pentatomidae, Thysanoptera pests, or for Acarina pests. SOLUTION: The pest-controlling agent includes: as an active ingredient, squalene or vitamin E. A controlling agent composition including the above agent and a basal agent is also provided. COPYRIGHT: (C)2010,JPO&INPIT