In this case, however, the printing surface 12 c of the conductive paste filler 12 is made flat. [0142] Meanwhile, Ag, Cu, C, Cu coated with Ag and other conductive pastes can be used to form the conductive paste filler 12. [0143] Next, after removing the separate paper 31, the projection 12 b of the conductive paste filler 12 which is projecting through the adhesive layer 3