Card type information device includes wiring board having a wiring pattern with an electronic component mounted on a first face of wiring board and an antenna connecting electrode, antenna board having antenna pattern with antenna terminal electrodes formed on a first face of antenna board, magnetic material placed between wiring board and antenna board confronting each other, flexible wiring board for coupling the antenna connecting electrode to antenna terminal electrode, and housing for accommodating wiring board, antenna board, magnetic material, and flexible wiring board. Wiring board and antenna board are made from one and the same insulating motherboard.