A 1-(N,N-disubstituted carbamoyl)4-(substituted sulfonyl)triazolin-5-one derivative represented by formula: wherein in formula, R 1 represents a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 haloalkenyl group, a C2-C6 alkynyl group, a C2-C6 haloalkynyl group, a C3-C8 cycloalkyl group which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, a C1-C6 alkoxy group, a C3-C8 cycloalkyl group, a C3-C6 cycloalkyl C1-C6 alkyl group, a phenyl group, or a C7-C11 aralkyl group, a C3-C6 cycloalkyl C1-C6 alkyl group, a C1-C6 alkoxy C1-C6 alkyl group, a C1-C6 haloalkoxy C1-C6 alkyl group, a phenyl group which may be monosubstituted or polysubstituted by a halogen atom, cyano, nitro, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C1-C6 alkylthio group, or a C1-C6 haloalkylthio group, a C7-C11 aralkyl group which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, or a C1-C6 alkoxy group, a heterocyclic ring which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, or a C1-C6 alkoxy group, a C1-C6 alkylamino group, a di C1-C6 alkylamino group in which alkyl groups may be the same or different and the alkyl groups may also combine with each other via an alkylene group to form a 3-membered ring, a 4-membered ring, a 5-membered ring and a 6-membered ring, a tetrahydropyranyl group, a tetrahydrofuryl group, a tetrahydropyranylmethyl group, or a tetrahydrofurfuryl group; each of R 2 and R 3 independently represents a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, a C3-C6 cycloalkyl group, a C3-C6 cycloalkyl C1-C6 alkyl group, a C1-C6 alkoxy C1-C6 alkyl group, a C1-C6 haloalkoxy C1-C6 alkyl group, a phenyl group which may be monosubstituted or polysubstituted by a halogen atom, cyano, nitro, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C1-C6 alkylthio group, or a C1-C6 haloalkylthio group, a C7-C11 aralkyl group which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, or a C1-C6 alkoxy group, or a heterocyclic ring which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C1-C6 alkoxy group, and when R 2 and R 3 are C1-C6 alkyl groups, these may also combine with each other to form a 3-membered ring, a 4-membered ring, a 5-membered ring, and a 6-membered ring with an alkylene group having from 2 to 5 carbon atoms as ring members; and R 4 represents a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, or a C1-C6 haloalkoxy group. R 1 represents a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 haloalkenyl group, a C2-C6 alkynyl group, a C2-C6 haloalkynyl group, a C3-C8 cycloalkyl group which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, a C1-C6 alkoxy group, a C3-C8 cycloalkyl group, a C3-C6 cycloalkyl C1-C6 alkyl group, a phenyl group, or a C7-C11 aralkyl group, a C3-C6 cycloalkyl C1-C6 alkyl group, a C1-C6 alkoxy C1-C6 alkyl group, a C1-C6 haloalkoxy C1-C6 alkyl group, a phenyl group which may be monosubstituted or polysubstituted by a halogen atom, cyano, nitro, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C1-C6 alkylthio group, or a C1-C6 haloalkylthio group, a C7-C11 aralkyl group which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, or a C1-C6 alkoxy group, a heterocyclic ring which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, or a C1-C6 alkoxy group, a C1-C6 alkylamino group, a di C1-C6 alkylamino group in which alkyl groups may be the same or different and the alkyl groups may also combine with each other via an alkylene group to form a 3-membered ring, a 4-membered ring, a 5-membered ring and a 6-membered ring, a tetrahydropyranyl group, a tetrahydrofuryl group, a tetrahydropyranylmethyl group, or a tetrahydrofurfuryl group; each of R 2 and R 3 independently represents a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, a C3-C6 cycloalkyl group, a C3-C6 cycloalkyl C1-C6 alkyl group, a C1-C6 alkoxy C1-C6 alkyl group, a C1-C6 haloalkoxy C1-C6 alkyl group, a phenyl group which may be monosubstituted or polysubstituted by a halogen atom, cyano, nitro, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C1-C6 alkylthio group, or a C1-C6 haloalkylthio group, a C7-C11 aralkyl group which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, or a C1-C6 alkoxy group, or a heterocyclic ring which may be monosubstituted or polysubstituted by a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C1-C6 alkoxy group, and when R 2 and R 3 are C1-C6 alkyl groups, these may also combine with each other to form a 3-membered ring, a 4-membered ring, a 5-membered ring, and a 6-membered ring with an alkylene group having from 2 to 5 carbon atoms as ring members; and R 4 represents a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, or a C1-C6 haloalkoxy group.