An azole derivative according to the invention is represented by Formula (XI) wherein R1 denotes a C1-C6 alkyl group, a C2-C6 alkenyl group or a C2-C6 alkynyl group; R2 denotes a C1-C4 alkyl group; each Y denotes a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C1-C4 alkoxy group, a C1-C4 haloalkoxy group, a phenyl group, a cyano group or a nitro group; and m denotes 0 to 5; when m is 2 or more, each Y may be the same or different. As a result, an azole derivative contained as an active ingredient in an agro-horticultural agent having an excellent controlling effect on diseases can be provided.