Transistor, method for manufacturing same, and semiconductor device comprising such transistor

The invention provides a process for production of a transistor that can form an oriented active layer by a convenient method while yielding a transistor with excellent carrier mobility. The process according to the invention is a process for production of a transistor with an active layer composed of an organic semiconductor compound-containing semiconductor film, the process comprising a step of stretching the semiconductor film and a step of pasting the semiconductor film onto the side on which the active layer is to be formed while heating and/or pressing, to obtain the active layer.