Provision of new imino derivative that can be insecticidal compounds having excellent properties such as the breadth of the spectrum and duration of the effect. I provide the imino derivative represented by the following formula (A). (Wherein, "Ar" is an optionally heterocyclic group which may have a substituent on the ring, "X". "R" representing 2, NR CH sulfur atom or an alkyl group or a hydrogen atom I represent. The "Ya", "C (= S) NR 1 R 2", "C (= S) SR 3", "C (= O) SR 4", "C (= S) OR 4", "SO 2 Z α ", or is selected from the" OZ β ". And "Z β" represents a given substituent or a hydrogen atom, "Z α", "R 1" - "R 4",.効果の持続性やスペクトルの広さ等の特性に優れた殺虫性化合物となり得る新規イミノ誘導体の提供。下記一般式(A)で示されるイミノ誘導体を提供する。(式中、「Ar」は、環上に置換基を有しても良いヘテロ環基を表し、「X」は、硫黄原子又はCH2、NRを表す。「R」は水素原子又はアルキル基を表す。「Ya」は、「C(=S)NR1R2」、「C(=S)SR3」、「C(=O)SR4」、「C(=S)OR4」、「SO2Zα」、又は「OZβ」から選択される。「R1」~「R4」、「Zα」、及び「Zβ」は、水素原子又は所定の置換基を表す。
