There is provided an aldehyde compound which is an intermediated compound in a process for producing an amide compound having an excellent harmful arthropod-controlling activity and represented by the formula (3): wherein R1, R2 and R3 independently represent a C1-C6 alkyl group optionally substituted with at least one halogen atom etc., R4, R5, R6 and R7 independently represent a halogen atom etc.本發明提供一種醛化合物,其為生產醯胺化合物之中間化合物,該醯胺化合物係由下式(3)表示,且對有害節肢動物具有極佳防治活性。其中,R1、R2和R3各自表示可視需要經至少一個鹵素原子取代之C1-C6烷基等,R4、R5、R6和R7各自表示鹵素原子等。
