TECHNOLOGY FOCUS - ELECTRONICS - Preferred Method: Forming the conductor pattern includes: preparing a base material having a laminated structure of support and conductor layers; forming a laminated structure of support layer, conductor layer and an adhesive layer; forming the conductor pattern on the support layer by processing and removing an exposed region of the conductor layer using an adhesive pattern (7) as a mask; etching the conductor pattern by wet etching; forming the adhesive pattern on conductor pattern by dividing respective unnecessary portions of the conductor layer and the adhesive layer from the laminated structure; and joining the insulating layer on the conductor pattern with the adhesive pattern sandwiched between the insulating layer and conductor pattern. The joining of insulating layer on the conductor pattern includes: forming the adhesive pattern, which is composed of adhesive layer on the conductor pattern; joining the insulating layer on the conductor pattern with the adhesive pattern sandwiched between the insulating layer and the conductor pattern; and forming a laminated structure of the adhesive and insulating layers on the conductor pattern. The step of joining further includes forming the adhesive layer on the support layer to cover the conductor pattern by processing the adhesive layer, where the adhesive layer is photosensitive. The step of processing includes subjecting the adhesive layer to exposure and development processing to form the adhesive pattern, where subjecting includes irradiating the adhesive layer with light through the support layer using the conductor pattern as a mask. Forming of adhesive pattern on the conductor layer includes subjecting the adhesive layer to exposure and development processing. The adhesive pattern is formed by separating the support layer and removing a region of the adhesive layer that is exposed and not overlapped with the conductor pattern, where removing is by using plasma. Preferred Components: The insulating layer contains a porous material. EXAMPLE - No suitable example given.