By formula (1) represent pyridine compounds [wherein:R1Represent C2 C10 halogenated alkyls etc.;R2Represent optionally C1 C6 alkyl at least one halogen atom etc.;R3Represent C1 C6 chain alkylenes etc.;R6Represent there can be C1 C6 alkyl of at least one halogen atom etc.;N represents 0,1 or 2;P and q each independently represents 0,1,2 or 3] or its N oxide there is the outstanding prophylactic-therapeutic effect to harmful arthropod.