<p>A radio device capable of reducing its size regardless of the shape of an antenna therefor. The radio device (10) is provided with a radio device antenna (1) having a transmitting/receiving face (A) for transmitting and/or receiving signals, and a radio circuit substrate (2) for subjecting the signals received at the radio device antenna to a predetermined processing, and/or for converting the signals to be transmitted into signals corresponding to the output from the radio device antenna (1). In the radio device (10), moreover, a straight line (II)-(I) starting from a predetermined point (I) on the radio circuit substrate (2) and extending from the predetermined point (I) in the direction opposite to a predetermined point (II) on the radio device antenna (1) passes through a predetermined point (III) on the radio device antenna (1).</p>
