PROBLEM TO BE SOLVED: To provide a composition that exhibits excellent pest controlling effect.SOLUTION: The pest controlling composition contains a tetrazolinone compound represented by the formula (1A), a tetrazolinone compound having a specific structure similar to the formula (1A), and one or more active ingredient selected from groups A-E: (group A) microbicide (group B) insecticide (group C) miticide (group D) phytotoxicity reducing agent and (group E) plant growth regulator.COPYRIGHT: (C)2014,JPO&INPIT【課題】有害生物に対する優れた防除効果を示す組成物を提供する。【解決手段】式(1A)で示されるテトラゾリノン化合物及び式(1A)に類似の特定構造を有するテトラゾリノン化合物と、群A~Eより選ばれる1種以上の活性成分とを含有する有害生物防除組成物。群A;殺菌剤、群B;殺虫剤、群C;殺ダニ剤、群D;薬害軽減剤、群E;植物生長調節剤【選択図】なし