Formula (1) [wherein, R1 represents a C1-C6 chain hydrocarbon group, R2, R3 and R4 are the same or different and represent a C1-C6 chain hydrocarbon group, etc., and R5 represents C1-C6 Represents a chain hydrocarbon group, G1, G2, G3, G4 and G5 are the same or different and represent a nitrogen atom, Q represents an oxygen atom or a sulfur atom, n represents 0, 1 or 2 . The condensed heterocyclic compound represented by the above has an excellent pest control effect.式（１）〔式中、Ｒ１はＣ１－Ｃ６鎖式炭化水素基等を表し、Ｒ２、Ｒ３及びＲ４は同一又は相異なり、Ｃ１－Ｃ６鎖式炭化水素基等を表し、Ｒ５はＣ１－Ｃ６鎖式炭化水素基等を表し、Ｇ１、Ｇ２、Ｇ３、Ｇ４及びＧ５は、同一又は相異なり、窒素原子等を表し、Ｑは酸素原子又は硫黄原子を表し、ｎは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。
