The present invention provides a herbicide composition that reliably exhibits a preventive effect on a wide variety of weeds using a lower amount of chemical. This goal is achieved with a herbicide composition containing, as active ingredients, (a) oxaziclomefone and/or (b) another preventive compound or an agriculturally permissible salt thereof.本發明係提供一種除草組成物,其係以較低的藥量對廣泛的雜草確實地顯示出防治效果。透過提供一種除草組成物,作為其有效成分包含:噁嗪草酮(a)、及至少1種其他除草化合物或其農業上所容許的鹽(b)。