Abstract: The present invention provides a highly safe antibacterial composition showing antibacterial activity against both Gram-positive bacteria and Gram-negative bacteria, of which flavor is not impaired. The antibacterial composition of the present invention contains nisin, and one or two or more kinds of plant-derived ingredients selected from the group consisting of juice, extract, and distillate of a Rosaceae plant, and a mixture of these. It is preferred that the Rosaceae plant is a plant belonging to the genus Prunus, it is more preferred that the plant belonging to the genus Prunus is Prunus mume, and it is particularly preferred that the plant-derived ingredient is Prunus mume fruit juice. The antibacterial composition of the present invention is useful especially as a composition for oral cavity.