To provide a specific 1, 2-phenylenediamine derivative.SOLUTION : The present invention provides a 1, 2-phenylenediamine derivative represented by the formula (I) (where Ar' /Het' is phenyl, pyridyl or the like substituted with chloro, methyl or the like, Ris H, substituted C6-C10 aryl or the like, V is -CH=CH-, O or the like, Cy is C4-C10 cycloalkyl, saturated heterocyclyl or the like, U is =CRr (where the carbon atom in =CRr is doubly bonded to a ring atom of Cy, thereby forming an exocyclic double bond) or the like, Rr is H, C1-C6 alkyl or the like).SELECTED DRAWING : None