To provide a herbicidal composition which is highly safe to crop plants and which is capable of controlling weeds problematic in e.g. paddy fields, upland fields and non-agricultural fields over a wide range of from preemergence to postemergence. A herbicidal composition comprising the following Component A which is at least one compound selected from the group consisting of isoxazoline derivatives of the formula I and their salts, and the following Component B, as active ingredients: wherein each of R 1 and R 2 which are independent of each other, is a hydrogen atom, a C 1 -C 10 alkyl group, a C 3 -C 8 cycloalkyl group or a C 3 -C 8 cycloalkyl C 1 -C 3 alkyl group, each of R 3 and R 4 which are independent of each other, is a hydrogen atom, a C 1 -C 10 alkyl group, a C 3 -C 8 cycloalkyl group, or R 1 , R 2 , R 3 and R 4 may form a 5- to 8-membered ring together with the carbon atoms to which they are bonded, each of R 5 and R 6 which are independent of each other, is a hydrogen atom or a C 1 -C 10 alkyl group, Y is a 5- or 6-membered aromatic heterocyclic or aromatic condensed heterocyclic group having an optional hetero atom selected from the group consisting of a nitrogen atom, an oxygen atom and a sulfur atom, Component B: Imazaquin, diuron, sulfentrazone, sulcotrione, norflurazon, clomazone, dimethenamid-P, prosulfocarb, isoproturon, trifluralin or triallate.
