A compound represented by Formula (I), or a salt thereof:wherein, R1 represents an unsubstituted or substituted C1-6 alkylthio group, or the like； A1 represents a nitrogen atom or CH； A2 represents a nitrogen atom or CR2； R2 and R3 each independently represents a hydrogen atom, an unsubstituted or substituted C6-10 aryl group, an unsubstituted or substituted 3- to 6-membered heterocyclyl group, or the like； B1 and B2 each independently represents a nitrogen atom or CR5, with the proviso that B1 and B2 do not represent CR5 at the same time, wherein R5 represents a hydrogen atom, an unsubstituted or substituted C1-6 alkyl group, or the like； R4 represents an unsubstituted or substituted C1-6 alkyl group, or the like, and R4 binds to any one of nitrogen atoms forming an imidazole ring or a triazole ring； and Ar represents an unsubstituted or substituted C6-10 aryl group or the like.
