According to one embodiment, an electronic device includes a cabinet having an upper case and a lower case. The upper case has an upper wall, and a keyboard mounting section is provided on the upper case. The cabinet incorporates a main board. A connector is provided on the top surface of the main board. A sub-board equipped with a digital tuner unit composed of a plurality of components including a first component and a second component is inserted in the connector. The first component has the greatest height of all of the components and is mounted on the top surface of the sub-board so as to face the upper wall outside the longitudinal direction of the keyboard mounting section.