A diaminoaryl derivative represented by formula or a salt thereof: wherein X and Y are each independently hydrogen, C 1-6 alkyl, C 2-10 alkenyl, C 2-10 alkynyl, C 3-6 cycloalkyl, C 3-6 cycloalkylC 1-3 alkyl, C 3-6 cycloalkylamino, C 1-6 alkoxy, C 1-5 alkylthio, C 1-5 alkylsulfinyl, C 1-5 alkylsulfonyl, phenyl, phenoxy, benzyl, hydroxy, cyano, nitro or halogen, wherein each of said alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, phenyl, phenoxy and benzyl may be independently substituted with one or more halogens; R is C 1-10 alkyl, C 3-6 cycloalkyl, C 3-6 cycloalkylC 1-3 alkyl, C 2-10 alkenyl, C 2-10 alkynyl, C 6-12 aryl or C 6-12 arylC 1-3 alkyl, wherein each of said alkyl, cycloalkyl, alkenyl, alkynyl and aryl may be independently substituted with 1 to 5 substituents selected from the group consisting of C 1-5 alkyl, haloC 1-5 alkyl, C 1-5 alkoxy, haloC 1-5 alkoxy, C 1-5 alkylamino, C 1-5 alkylimino, nitro, amino, cyano, C 1-5 alkylthio, C 1-5 alkylsulfinyl, C 1-5 alkylsulfonyl and halogen; W is C 6-12 aryl or 5 to 13-membered heteroaryl, wherein each of said aryl or heteroaryl may be independently substituted with 1 to 5 substituents selected from the group consisting of at least one halogen, C 1-4 alkyl, C 2-5 alkenyl, C 2-5 alkynyl, C 1-4 alkoxy, haloC 1-4 alkyl, hydroxyl and cyano; Z is halogen, cyano, amino, hydroxyl, mercapto, cyanothio, C 1-6 alkyl, haloC 1-6 alkyl, C 3-6 cycloalkyl, C 3-6 cycloalkylC 1-3 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 alkoxy, haloC 1-6 alkoxy, C 1-5 alkylthio, C 1-6 alkylamino, C 1-6 alkylimino, C 1-6 alkylsulfinyl, C 1-6 alkylsulfonyl, C 1-6 alkylaminocarbonyl, -(CH 2)n-Q, -(CH 2)n-O-Q, -(CH 2)n-O-(CH 2)m-Q or -(CH 2)n-S-Q, wherein Q is phenyl, 5 to 10-membered heteroaryl or 5 to 10-membered heterocycloalkyl, and n and m are each independently integers of from 1 to 3; and said heteroaryl and heterocycloalkyl independently contain one to three heteroatoms selected from the group consisting of N, O and S. wherein X and Y are each independently hydrogen, C 1-6 alkyl, C 2-10 alkenyl, C 2-10 alkynyl, C 3-6 cycloalkyl, C 3-6 cycloalkylC 1-3 alkyl, C 3-6 cycloalkylamino, C 1-6 alkoxy, C 1-5 alkylthio, C 1-5 alkylsulfinyl, C 1-5 alkylsulfonyl, phenyl, phenoxy, benzyl, hydroxy, cyano, nitro or halogen, wherein each of said alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, phenyl, phenoxy and benzyl may be independently substituted with one or more halogens; R is C 1-10 alkyl, C 3-6 cycloalkyl, C 3-6 cycloalkylC 1-3 alkyl, C 2-10 alkenyl, C 2-10 alkynyl, C 6-12 aryl or C 6-12 arylC 1-3 alkyl, wherein each of said alkyl, cycloalkyl, alkenyl, alkynyl and aryl may be independently substituted with 1 to 5 substituents selected from the group consisting of C 1-5 alkyl, haloC 1-5 alkyl, C 1-5 alkoxy, haloC 1-5 alkoxy, C 1-5 alkylamino, C 1-5 alkylimino, nitro, amino, cyano, C 1-5 alkylthio, C 1-5 alkylsulfinyl, C 1-5 alkylsulfonyl and halogen; W is C 6-12 aryl or 5 to 13-membered heteroaryl, wherein each of said aryl or heteroaryl may be independently substituted with 1 to 5 substituents selected from the group consisting of at least one halogen, C 1-4 alkyl, C 2-5 alkenyl, C 2-5 alkynyl, C 1-4 alkoxy, haloC 1-4 alkyl, hydroxyl and cyano; Z is halogen, cyano, amino, hydroxyl, mercapto, cyanothio, C 1-6 alkyl, haloC 1-6 alkyl, C 3-6 cycloalkyl, C 3-6 cycloalkylC 1-3 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 alkoxy, haloC 1-6 alkoxy, C 1-5 alkylthio, C 1-6 alkylamino, C 1-6 alkylimino, C 1-6 alkylsulfinyl, C 1-6 alkylsulfonyl, C 1-6 alkylaminocarbonyl, -(CH 2)n-Q, -(CH 2)n-O-Q, -(CH 2)n-O-(CH 2)m-Q or -(CH 2)n-S-Q, wherein Q is phenyl, 5 to 10-membered heteroaryl or 5 to 10-membered heterocycloalkyl, and n and m are each independently integers of from 1 to 3; and said heteroaryl and heterocycloalkyl independently contain one to three heteroatoms selected from the group consisting of N, O and S.