A manufacturing method of a film insert molded article in which no resin layer is seen in the front and no wrinkle is generated in a film is provided. A thermoformed film (11) for coating is arranged within a cavity (15), and molten resin is injected so that a film insert molded article (50) molded integrally with the film (11) for coating and having a coating plane coated with the film (11) for coating is obtained. A printing ink layer (20) and a binder layer (30) are formed in a raw material film (10). The raw material film (10) is cut out and the film (11) for coating is formed so as to have a size for coating the coating plane and being able to form an outer circumferential bending portion (12) arranged in an outer circumferential side portion (41) by adding a width exceeding a heat shrinking amount of the film. After the film (11) for coating is preheated, the film (11) for coating is thermoformed so that a predetermined three-dimensional shape (13) and the outer circumferential bending portion (12) are formed. The film (11) for coating in which the three-dimensional shape (13) and the outer circumferential bending portion (12) are formed, is arranged within the cavity (15) such that the binder layer (30) comes into contact with molten resin. The molten resin is then injected.