It is an object of the present invention to provide a method for manufacturing an inexpensive organic TFT which does not depend on an expensive dedicated device and does not expose an organic semiconductor to atmospheric air. Moreover, it is another object of the present invention to provide a method for manufacturing an organic TFT at low temperature so as not to cause a problem of pyrolyzing a material. In view of the foregoing problems, one feature of the present invention is that a film-like protector which serves as a protective film is provided over an organic semiconductor film. The film-like protector can be formed by being fixed to a film-like support body with an adhesive agent or the like.