(Problems) To provide a therapeutic agent for infections comprising certain substances together with 15K granulysin, which has characteristics different from antibiotics and no cytotoxicity, to which bacteria can hardly acquire resistance, and shows stronger bactericidal effect against Mycobacterium tuberculosis than an agent comprising 15K granulysin by itself. (Means for solving problems) The present invention provides a therapeutic agent for infections comprising as active ingredient: a combination of 15K granulysin and 15K granulysin in vivo expression vector, a combination of 15K granulysin and at least one interleukin selected from IL-6, IL-23 or IL-27, a combination of 15K granulysin in vivo expression vector and at least one interleukin selected from IL-6, IL-23 or IL-27, or a combination of 15K granulysin in vivo expression vector and HSP65DNA and IL-12DNA in vivo expression vector, which enhances killing effects on bacteria and has less side effect, and to which bacteria can hardly acquire resistance.
