Diaryl-azole compound and formulation for controlling harmful organism

A compound represented by Formula (I) or a salt thereof.

• wherein
• R1 represents an unsubstituted or substituted C1-6 alkylthio group, an unsubstituted or substituted C1-6 alkylsulfinyl group, an unsubstituted or substituted C1-6 alkylsulfonyl group, a halogeno group, or a group represented by —S(═O)(═N—Ra)—Rb, in which each of Ra and Rb independently represents an unsubstituted or substituted C1-6 alkyl group,
• A1 represents a nitrogen atom,
• A2 represents CR2,
• each of R2 and R3 independently represents a hydrogen atom, an unsubstituted or substituted C1-6 alkyl group, an unsubstituted or substituted C2-6 alkenyl group, an unsubstituted or substituted C2-6 alkynyl group, a hydroxyl group, an unsubstituted or substituted C1-6 alkoxy group, an unsubstituted or substituted C1-6 alkylamino group, an unsubstituted or substituted C1-6 alkyl carbonylamino group, an unsubstituted or substituted C1-6 alkoxy carbonyl group, an unsubstituted or substituted C1-6 alkyl aminocarbonyl group, an unsubstituted or substituted C1-6 alkylthio group, an unsubstituted or substituted C1-6 alkylsulfinyl group, an unsubstituted or substituted C1-6 alkylsulfonyl group, an unsubstituted or substituted C3-8 cycloalkyl group, an unsubstituted or substituted C6-10 aryl group, an unsubstituted or substituted, 3- to 6-membered heterocyclyl group, a 2-(propan-2-ylidene)hydrazinyl group, a benzyloxy group, a halogeno group, a cyano group, or a nitrile group, or R2 and R3 may form an unsubstituted or substituted, 5- to 6-membered ring, together with the carbon atoms to which R2 and R3 are bonded,
• each of B1 and B2 independently represents a nitrogen atom or CR5, with the proviso that both B1 and B2 do not simultaneously represent CR5, in which R5 represents a hydrogen atom, an unsubstituted or substituted C1-6 alkyl group, an unsubstituted or substituted C6-10 aryl group, a halogeno group, a cyano group, or a nitro group,
• R4 represents an unsubstituted or substituted C1-6 alkyl group, an unsubstituted or substituted C2-6 alkenyl group, an unsubstituted or substituted C2-6 alkynyl group, an unsubstituted or substituted C3-8 cycloalkyl group, a hydroxyl group, an unsubstituted or substituted C1-6 alkoxy group, a formyl group, an unsubstituted or substituted C1-6 alkyl carbonyl group, an unsubstituted or substituted C1-6 alkoxy carbonyl group, or an unsubstituted or substituted C1-6 alkylsulfonyl group, and R4 bonds 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 an unsubstituted or substituted, 5- to 10-membered heteroaryl group.