Disclosed is a hydrazine compound represented by the formula (1) below, which has an excellent control activity against a harmful arthropod. (1) (In the formula, R1, R5, R6 and R7 represent a hydrogen atom or the like at least one of R2 and R3 represents a C1-C6 alkyl group substituted by a cyano group R4 represents a halogen atom or the like J represents 1-(3-chloro-2-pyridyl)-3-bromo-1H-pyrazol-5-yl group or the like and M represents a hydrogen atom, a C1-C6 alkyl group which may be substituted by a halogen atom, or the like.)
