The present invention relates to an antiviral composition containing an or extract or a fraction thereof as an active ingredient. In detail, an or extract or a fraction thereof can induce the secretion of interferon-γ (IFN-γ) which is an immune-related cytokine in a natural killer (NK) cell, and thus exhibits high antiviral activity and superior effects for viral diseases, and therefore can be effectively used in an antiviral composition.