The present invention relates to a sublingually administrable vaccine composition useful to be a preventive or therapeutic agent for influenza. The present invention particularly relates to a vaccine composition capable of effectively inducing a systemic immune response and a mucosal immune response when at least one selected from the group consisting of a toll-like receptor 4 (TLR4) agonist, a toll-like receptor 2/6 (TLR2/6) agonist, and cyclic dinucleotide, or a derivative or salt thereof is sublingually administered as an adjuvant together with an antigen being inactivated whole influenza virus.
