Pest controlling composition comprising a novel Iminopirijin derivative

And Iminopirijin derivative represented by the following formula (I), comprising at least one other pest control agent, to provide a pest controlling composition: [Formula 1] [In the formula, Ar heterocycle members 5-6 which may be substituted, A is shows a heterocycle having an unsaturated bond 5-10 membered containing one or more nitrogen atoms, the nitrogen atom present on the ring to the adjacent position, having a substituted imino group R group, Y represents hydrogen, a halogen, etc., R is represented by the following formula (a) ~ (e), (y) and (z) group, ## STR2 ## It indicates any of].