To provide a multidrug-resistant Gram positive bacteria antibacterial agent containing as an active ingredient a novel component to which multidrug-resistant bacteria are not resistant, and an external agent containing the same. The multidrug resistant Gram-positive bacteria antibacterial agent according to the present invention contains an amphipathic compound having an HLB value of greater than 9.5 and 20 or less and an acyl group as an active ingredient. The external agent according to the present invention contains the multidrug resistant Gram-positive bacteria antibacterial agent.
