The present invention provides a compound having an excellent efficacy for controlling pests. A tetrazolinone compound of a formula (1): [wherein R1 represents an C6-C16 aryl group, an C1-C12 alkyl group, or a C3-C12 cycloalkyl group, etc., which each optionally be substituted； R2, R3, R4 and R5 represent independently of each other a hydrogen atom, a halogen atom or an C1-C3 alkyl group, etc.； R6 represents an C1-C6 alkyl group, a C3-C6 cycloalkyl group, a halogen atom, a C1-C6 haloalkyl group, an C2-C6 alkenyl group, an C1-C6 alkoxy group, or a C1-C6 haloalkoxy group, etc.； R7, R8 and R9 represent independently of each other a hydrogen atom, a halogen atom, or an C1-C4 alkyl group, etc.； X represents an oxygen atom or a sulfur atom； and R10 represents an C1-C6 alkyl group, etc.] shows an excellent controlling efficacy on pests.本發明提供一種具有防治病蟲害之優越效果的化合物。一種式(1)之四唑啉酮化合物於病蟲害顯現優越的防治效果：[其中R1表示C6-C16芳基、C1-C12烷基、或C3-C12環烷基等，其各視需要經取代；R2，R3，R4和R5各自獨立地表示氫原子、鹵素原子或C1-C3烷基等；R6表示C1-C6烷基、C3-C6環烷基、鹵素原子、C1-C6鹵烷基、C2-C6烯基、C1-C6烷氧基、或C1-C6鹵烷氧基等；R7，R8和R9各自獨立地表示氫原子、鹵素原子、或C1-C4烷基等；X表示氧原子或硫原子；以及R10表示C1-C6烷基等。]
