Formula (1) [In the formula, A1 represents -NR4-, etc., A2 represents a nitrogen atom, R1 represents an ethyl group, a cyclopropyl group, or a cyclopropylmethyl group, and R2 represents -S (O) mR6. Or -C (R7) (CF3) 2, wherein R4 represents a C1-C6 alkyl group optionally having one or more halogen atoms, R6 represents a C1-C6 haloalkyl group, and R7 represents fluorine. An atom or a chlorine atom is represented, and m and n represent 0, 1 or 2, respectively. The condensed heterocyclic compound represented by the above has an excellent pest control effect.式（１）〔式中、Ａ１は－ＮＲ４－等を表し、Ａ２は窒素原子等を表し、Ｒ１はエチル基、シクロプロピル基、又はシクロプロピルメチル基を表し、Ｒ２は－Ｓ（Ｏ）ｍＲ６、又は－Ｃ（Ｒ７）（ＣＦ３）２を表し、Ｒ４は１個以上のハロゲン原子を有していてもよいＣ１－Ｃ６アルキル基を表し、Ｒ６はＣ１－Ｃ６ハロアルキル基を表し、Ｒ７はフッ素原子又は塩素原子を表し、ｍ及びｎは、それぞれ０、１又は２を表す。〕で示される縮合複素環化合物は優れた有害生物防除効果を有する。
