Synergistic herbicidal agents containing an arylsulfonylaminocarbonyl-triazolinone derivative (I) are new. Synergistic herbicidal agents contain: (1) an arylsulfonylaminocarbonyl-triazolinone derivative of formula (I) and/or one of its salts； (2) 1-3 herbicides from acifluorfen-sodium, amicarbazone, amitrole, azafenidin, azimsulfuron, beflubutamid, benfluralin, bensulfuron, benfendizone, benzobicyclon, butafenacil-allyl, butroxydim, cafenstrole, caloxydim, tepraloxydim, chlorimuron-ethyl, cinidon-ethyl, clefoxydim, clethodim, cycloxydim, cyhalofop-butyl, diclosulam, diflufenzopyr, dimepiperate, dimethenamid-P, epropodan, fenoxaprop-P-ethyl, fentrazamide, florasulam, fluazifop, fluazolate, flufenacet, flufenpyr, flumioxazin, fluorochloridone, fomesafen, foramsulfuron, haloxyfop, iodosulfuron-methyl-sodium, isoxachlortole, lactofen, mefenacet, mesosulfuron, mesotrione, metamitron, S-metolachlor, oryzalin, oxadiargyl, oxadiazon, oxaziclomefone, oxyfluorfen, penoxsulam, pethoxamid, profluazol, propanil, propaquizafop, propisochlor, pyraclonil, pyridatol, pyriftalid, pyriminobac-methyl, pyrithiobac-sodium, quinchlorac, quizalofop, sethoxydim, thiazopyr, triclopyr, trifloxysulfuron, triflusulfuron-methyl, and N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]-carbonyl]-3-(N-methyl-N-methylsulfonyl-amino])-2-pyridinesulfonamide； and optionally (3) a compound which enhances plant tolerance from AD-67, diclonon, BAS-145138, benoxacor, cloquintocet-mexyl, see also related compounds disclosed in EP 86750, EP 94349, EP 191736 and EP 492336, cumyluron, cyometrinil, 2,4-D, diamuron, dymron, dicamba, dimepiperate, DKA-24, dichlormid, fenclorim, fenchlorazol-ethyl (see also related compounds disclosed in EP 174562 and EP 346620), flurazole, fluxofenim, furilazole, MON-139900, isoxadifen-ethyl (see also related compounds disclosed in WO 9507897), mefenpyr-diethyl (see also related compounds disclosed in WO 9107874), MG-191, oxabetrinil, PPG-1292, R-28725, R-29148, methyl 1-(2-chloro-phenyl)-5-
