[Problem] To provide a novel agricultural chemical, and particularly an herbicide. [Solution] A ketone or oxime compound represented by formula (1) and a herbicide containing the same (in the formula: B represents B-1, B-2, or B-3; Q represents an oxygen atom, =NOR7, etc.; R6 represents a hydrogen atom, C1-C6 alkyl group, etc.; R7 represents a hydrogen atom, C1-C6 alkyl group, etc.; R8a, R8b, R9a, R9b, R10, R11, R12, R13, and R14 each independently represent a hydrogen atom or C1-C6 alkyl; m represents the integer 1 or 2; and n represents the integer 0, 1, or 2).