Antibacterial actions against Staph. aureus (Terashima strain) of 54 kinds of wild plants collected at the foot of Mount Asama and in the suburbs of Mayebashi City were examined. Antibacterial actions were found in the following plants: Roripa Nasturtium-aquaticum, Sophora angustifolia, Perilla frutescens var. crispa, Fagopyrum esculentum, Eclipta alba, Ligularia tussilaginea, Allium fistulosum, Siphonostegia chinensis, Calystegia japonica, Paederia chinensis, Artemissia vulgaris var. indica.