Disclosed is a herbicide composition, which is highly safe to a useful crop, and which can control various weeds that may cause troubles e.g. in paddies, upland fields or non-agricultural fields within a wide range from a pre-germination stage to a growing stage. A herbicidal composition comprising the following component A which represents at least one compound selected from the group consisting of an isoxazoline derivatives represented by the formula [I] and salts thereof and the following component B as active ingredients； component A:wherein each of Rand Rwhich are independent from each other represents a hydrogen atom, a C-Calkyl group, a C-Ccycloalkyl group or a C-Ccycloalkyl-C-Calkyl group, each of Rand Rwhich are independent from each other represents a hydrogen atom, a C-Calkyl group, a C-Ccycloalkyl group, or R, R, Rand R, together with carbon atoms to which they are bound, may form a 5-8-membered ring； each of Rand Rwhich are independent from each other represents a hydrogen atom or a C-Calkyl group； Y represents a 5- or 6-membered aromatic heterocyclic group or aromatic hetero fused ring group having an optional heteroatom selected from the group consisting of a nitrogen atom, an oxygen atom and a sulfur atom； component B-3: photosynthesis II Inhibitors selected from the group comprising: (a) triazine derivatives: ametryn, dimethametryn, desmetryn, prometryn, propazine, simetryn, terbumeton, terbuthylazine, terbutryn, trietazine； (b) triazinone derivatives: hexazinone, metamitron； (c) triazolinone derivatives: amicarbazone； (d) uracil derivatives: bromacil, lenacil, terbacil； (e) pyridazinone derivatives: chloridazon； (f) phenylcarbamates: desmedipham, phenmedipham； (g) urea derivatives: chlorbromuron, chlorotoluron, chloroxuron, dimefuron, diuron, ethidimuron, fenuron, fluometuron, isoproturon, isouron, methabenzthiazuron, metobromuron, metoxuron, monolinuron, neburon, siduron, tebuthiuron； (h) anilides: pentanochlor, propanil； (i) hydroxybenzonitriles:
