ABSTRACT - 599682 Disclosed herein is a noxious organism control agent which can be synthesized advantageously on an industrial scale, has an excellent biological activity and excellent residual efficacy, and has a novel skeleton. Specifically disclosed are: a 1-heterodiene derivative represented by formula (1) or a salt thereof, wherein the variables are as defined in the specification and a noxious organism control agent comprising the 1-heterodiene derivative or the salt thereof as an active ingredient.
