<p>Provided is a reflective film-forming technique which can simplify and reduce the cost of the film-forming apparatus configuration. The film-forming method of the present invention comprises a reflective film-formation step (P2) for forming a light-reflecting film by performing vapor deposition on an object while introducing air into a film-formation region, a polymer film formation step (P3) for forming a water-repellent polymer film on this reflective film, and a hydrophilization treatment step (P5) for performing hydrophilization treatment by plasma on the above-mentioned water-repellent polymer film while introducing air into the film-formation region. This invention enables formation of the reflective film and hydrophilization treatment of the polymer film without use of argon gas.</p>
