A compound represented by formula (I) [wherein Het 1 represents Het 1 -1, Het 1 -2, Het 1 -3, Het 1 -4 or Het 1 -5； R 1 represents a halogen atom or the like； R 1a and R 4 independently represent a C1-C4 linear hydrocarbon group having at least one halogen atom； X 1 represents NR 30 , an oxygen atom or a sulfur atom； X 2 represents a nitrogen atom or CR 31 ； X 3 represents a nitrogen atom or CR 32 ； X 4 represents a nitrogen atom or CR 33 ； A 1 represents a nitrogen atom or CR 9 ； and the combination of A 2 , A 3 and A 4 represents a combination in which A 2 is CR 6 , A 3 is CR 7 and A 4 is CR 8 , a combination in which A 2 , is a nitrogen atom, A 3 is CR 7 and A 4 is CR 8 , a combination in which A 2 is CR 6 , A 3 is a nitrogen atom and A 4 is CR 8 , or a combination in which A 2 is CR 6 , A 3 is CR 7 and A 4 is a nitrogen atom] or a N-oxide compound thereof has an excellent control effect against arthropod pests.
