A 1-heterodiene derivative represented by formula (1) or its salt: in formula (1), Q1 represents an optionally substituted C6-10 aryl group, an optionally substituted benzyl group or an optionally substituted heterocyclic group, wherein when Q1 is substituted, the substituent is at least one selected from the group consisting of optionally substituted C1-6 alkyl group, an optionally substituted C2-6 alkenyl group, an optionally substituted C2-6 alkynyl group, an optionally substituted C3-6 cycloalkyl group , an optionally substituted C4-8 cycloalkenyl group, an optionally substituted C6-10 aryl group, an optionally substituted heterocyclic group, an optionally substituted C1-11 acyl group, an optionally substituted (1-imino) -C1-6 alkyl group, a optionally substituted hydroxy group, an optionally substituted amino group, an optionally substituted mercapto group, a substituted sulfonyl group, a substituted sulfinyl group, a silyl group, a halogen group, cyano group and nitro group, W represents hydrogen atom or an optionally substituted C1-6 alkyl group, X represents oxygen atom or sulfur atom, Y represents N-Q3, where Q3 represents a optionally substituted C6-10 aryl group or an optionally substituted heterocyclic group, wherein when Q3 is substituted, the substituent is at least one selected from the group consisting of optionally substituted C1-6 alkyl group, an optionally substituted C2-6 alkenyl group, an optionally substituted C2-6 alkynyl group, an optionally substituted C3-6 cycloalkyl group, an optionally substituted C4-8 cycloalkenyl group, an optionally substituted C6-10 aryl group, an optionally substituted heterocyclic group, an optionally substituted C1-11 acyl group , an optionally substituted (1- imino) -C 1-6 alkyl group, an optionally substituted hydroxy group, an optionally substituted amino group, a mer group optionally substituted capta, a substituted sulfonyl group, a substituted sulfinyl group, a silyl group, a halogen group, cyano group and ni
