Formula (1) [wherein R1 represents a C1-C6 chain hydrocarbon group or the like which may have one or more atoms or groups selected from group X, and R2, R3, R4 and R5 are the same. Or, differently, it represents a C1-C6 chain hydrocarbon group which may have one or more atoms or groups selected from group X, and R6 represents one or more atoms or groups selected from group W. Represents a C1-C6 chain hydrocarbon group or the like which may have, G1, G2, G3, G4 and G5 are the same or different and represent a nitrogen atom or the like, 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は群Ｘより選ばれる１個以上の原子若しくは基を有していてもよいＣ１－Ｃ６鎖式炭化水素基等を表し、Ｒ２、Ｒ３、Ｒ４及びＲ５は同一又は相異なり、群Ｘより選ばれる１個以上の原子若しくは基を有していてもよいＣ１－Ｃ６鎖式炭化水素基等を表し、Ｒ６は群Ｗより選ばれる１個以上の原子若しくは基を有していてもよい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。
