Disclosed are: a method for utilizing a kombu (kelp) extract as an antibacterial auxiliary agent; and a method for utilizing a combination of the antibacterial auxiliary agent, lactoperoxidase, glucose oxidase and glucose as an antibacterial composition having a potent antibacterial activity. Specifically disclosed are: an antibacterial auxiliary agent comprising a fraction having a molecular weight of 5000 or less and produced from a kombu extract as an active ingredient; an antibacterial composition comprising the antibacterial auxiliary agent, lactoperoxidase, glucose oxidase and glucose; an antibacterial composition as mentioned above, which additionally comprises xanthane gum; and a food or beverage containing the antibacterial composition.
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