To provide novel pesticides, especially insecticides or acaricides. A condensed heterocyclic compound represented by the formula (1) or its salt or an N-oxide thereof wherein 0 substituted with -S(O)nR1 is a ring represented by any one of 01 , 02 and 0 3, Q is a ring represented by any one of Q1 , Q2, Q3 and Q4, R1 is C1-C6 alkyl, C1-C6 haloalkyl, (C1-C5) alkyl optionally substituted with R18, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, C3-C6 alocycloalkyl, C3-C6 cycloalkyl (C1-C5) alkyl, C3-C6 halocycloalkyl (C·J-C6) alkyl or hydroxy (C1-C5) alkyl, R18 is C1-Ca alkoxycarbonyl, and n is an integer of 0, 1 or 2.
