PROBLEM TO BE SOLVED: To provide a composition that exhibits excellent pest controlling effect.SOLUTION: A pest control composition comprises a tetrazolinone compound represented by formula (1), and one or more component selected from groups A-E, the composition exhibiting excellent pest controlling effect. In the formula, Ris a halogen atom, a C1-6 alkyl group or the like； R-Rand R-Rare H or the like respectively； Ris a C1-C 6 alkyl group or the like； and X is O or S. The group A is a fungicide, group B is an insecticide and a miticide, group C is a herbicide, group D is a phytotoxicity reducing agent, and group E is a plant growth regulator.【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こと。【解決手段】式（１）で示されるテトラゾリノン化合物と、群Ａ～群Ｅより選ばれる１種以上の成分とを含有する有害生物防除組成物は、有害生物に対する優れた防除効果を示す。〔Ｒ1はハロゲン原子、Ｃ１－６アルキル基等；Ｒ2～Ｒ5及びＲ7～Ｒ9は各々、Ｈ等；Ｒ6はＣ１－Ｃ６アルキル基等；Ｘは、Ｏ又はＳ〕群Ａ；殺菌剤、群Ｂ；殺虫剤、殺ダニ剤、群Ｃ；除草剤、群Ｄ；薬害軽減剤、群Ｅ；植物成長調整剤【選択図】なし
