To make it possible to produce a pyridine compound represented by formula (1) that is useful as an insecticide by reacting a compound represented by formula. (2) and a compound represented by formula (3). (In the formula, L 1 represents a halogen atom； R 2 , R 3 , R 4 , R 5 , and R 6 represent chain hydrocarbon groups, etc., having 1-6 carbon atoms optionally substituted by fluorine atoms. A 1 represents-NR 7 -, an oxygen atom, or a sulfur atom； A 2 represents a nitrogen atom or =CR 8 -. R 7 and R 8 represent C1-6 chain hydrocarbon groups or hydrogen atoms. M + represents a sodium ion, a potassium ion, or a lithium ion.)
