PROBLEM TO BE SOLVED: To provide a novel pest control agent, in particular, an insecticide or an acaricide.SOLUTION: This invention provides: a thiazole derivative expressed by Formula (1), where A1 represents N(O)m2 or CR1, A2 represents a pyrazole group which may be substituted, R1, R2, R3 each independently represent a hydrogen atom, a halogen atom, C1-C6 alkyl or the like, n represents an integer of 0-3, and m1 and m2 each independently represent an integer of 0 or 1 and a pest control agent containing the thiazole derivative.COPYRIGHT: (C)2014,JPO&INPIT【課題】新規な有害生物防除剤、特に殺虫剤又は殺ダニ剤の提供。【解決手段】式(1):[式中、A1はN(O)m2又はCR1を、A2は置換されても良い、ピラゾール基を、R1、R2、R3は各々独立して水素原子、ハロゲン原子、C1~C6アルキル等を、nは0~3の整数を、m1及びm2は各々独立して0又は1の整数を表す。]で表されるチアゾール誘導体及び有害生物防除剤。【選択図】なし