The present invention provides a novel transfer vector and a recombinant baculovirus; methods for the production thereof; and pharmaceuticals containing the recombinant baculovirus as an active ingredient, which are useful as preventive or therapeutic drugs for infectious diseases such as malaria and influenza. More specifically, the invention provides a recombinant transfer vector capable of expressing a foreign gene fused to a virus gene under the control of a dual promoter; a recombinant baculovirus; methods for the production thereof; and pharmaceuticals containing the recombinant baculovirus as an active ingredient.