In a communication control device having antenna electrodes to which an antenna is connected, a power supply circuit, and a communication circuit which have been mounted on a mounting board, the antenna electrodes are situated at one corner of a principal surface of the mounting board, the communication circuit is situated at a first side of the principal surface having a common corner, and the power supply circuit is situated at second side facing the first side. A first signal path connecting the antenna electrodes and the communication circuit extends along the first side, and a second signal path connecting the antenna electrodes and the power circuit extends along a third side which has a common corner and which is orthogonal to the first side. In so doing, it is possible for the communication control device to be smaller, while minimizing diminishment of characteristics of the communication control device.