An antenna built-in module which incorporates an antenna, is thin and excellent in antenna characteristics, a card type information device and a method for manufacturing the same are provided. A wiring board (110) which has a wiring pattern (120) and in which an electronic component is mounted on at least one surface thereof, a magnetic substance (160) embedded in the other surface of the wiring board (110), an antenna pattern (170) provided on the magnetic substance (160), the wiring pattern (120) of the wiring board (110) and the antenna terminal electrode of the antenna pattern (170) are connected by a conductive via (200).