Benzamide derivatives represented by general formula (1); and insecticides for agricultural and horticultural use and usage thereof wherein Z1 is O or S; R is H, (substituted) alkyl, or alkoxycarbonyl; X is halogeno, cyano, nitro, C¿3?-C6 (halo) cycloalkyl, (substituted) phenyl, a (substituted) heterocyclic group, or -A?1-R1¿ [wherein A1 is -O-, -S-, -SO-, -SO¿2?-, -C(=O)-, or -C(=NOR2)- (wherein R?2¿ is H, C¿1?-C6 (halo)alkyl, (substituted) phenylated C1-C4 alkyl, or the like); and R?1¿ is halogeno, C¿3?-C6 cycloalkyl, C3-C6 halocycloalkenyl, (substituted) phenyl, or the like]; n is 0 to 4; Y is halogeno, cyano, nitro, C3-C6 halocycloalkyl, (substituted) phenyl, or the like; m is 1 to 5; Q is a heterocycle such as oxazoline; and B?1 to B4¿ are each CH or N.