New pest control agents, particularly insecticides or acaricides, are provided. General formula (1): [Chemical Formula 1] [wherein B represents a pyrazole ring represented by the following structural formula, [Chemical Formula 2] A1 represents —N (—O) m2 or —CR1； A2 represents a heterocyclic ring of D1-1 to D1-102, phenyl substituted with (Z1) q, and the like, R1, R3, and R4 each represent a hydrogen atom, a halogen atom, C1 to C6 alkyl, and the like, and Z1 represents It represents a halogen atom, C1-C6 alkyl, (C1-C12) alkyl optionally substituted with R5, and the like. ] The pyrazole derivative and pest control agent represented by these.新規な有害生物防除剤、特に殺虫剤又は殺ダニ剤を提供する。一般式（１）：［化１］［式中、Ｂは、下記の構造式で表されるピラゾール環を表し、［化２］Ａ１は、－Ｎ（－Ｏ）ｍ２又は－ＣＲ１を表し、Ａ２は、Ｄ１－１～Ｄ１－１０２の複素環、（Ｚ１）ｑで置換されたフェニル等を表し、Ｒ１、Ｒ３、Ｒ４はそれぞれ水素原子、ハロゲン原子、Ｃ１～Ｃ６アルキル等を表し、Ｚ１はハロゲン原子、Ｃ１～Ｃ６アルキル、Ｒ５で任意に置換された（Ｃ１～Ｃ１２）アルキル等を表す。]で表されるピラゾール誘導体及び有害生物防除剤。
