PROBLEM TO BE SOLVED: To provide a novel pest controller and, in particular, an insecticide or an acaricide.SOLUTION: There are provided a thiazole derivative expressed by formula (1) [in the formula, A1 represents -N(O)m2 or -CR1 R1 and R2 each represent a hydrogen atom, a halogen atom, 1-6C alkyl, or the like R3 represents a halogen atom Ra represents -C(O)NRbRc, -C(S)NRbRc, or the like Rb represents a hydrogen atom, 1-6C alkyl, or the like Rc represents 1-6C alkyl, -C(O)R7, or the like R7 represents 1-6C alkyl or the like and m1 and m2 express an integer of 0 or 1] and a pest controller.COPYRIGHT: (C)2013,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を表し、R1、R2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、R3は、ハロゲン原子を表し、Raは、-C(O)NRbRc、-C(S)NRbRc等を表し、Rbは、水素原子、C1~C6アルキル等を表し、Rcは、C1~C6アルキル、-C(O)R7等を表し、R7は、C1~C6アルキル等を表し、m1及びm2は、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