The invention provides a broadleaf perennial weeds control agent for lawn which not only shows a high herbicidal effect to a broadleaf perennial weeds which is difficultly controlled by a conventional herbicide for lawn and/or weeds having resistance to a conventional herbicide, but also shows enough safety for lawn. The invention also provides a broadleaf perennial lawn weeds control method in which the control agent is used to soil or stalk. The control agent contains 1, 5-dipheny1-1H-1, 2, 4-triazole-3-carboxamide derivatives shown in the Formula 1, as an active ingredient, Formula 1wherein R presents a C1-10 alkyl that may be substituted by a fluorine atom, X1 presents a halogen atom or a C1-3 alkyl, X2 presents a hydrogen atom or a Halogen atom, Y1 and Y2 are independent each other, and present a hydrogen atom or a fluorine atom.
