An object here is to provide a control device which can be reduced in size, weight and cost while being able to prevent unauthorized access. The control device includes: a microcontroller having a storage device, a processor, a package in which the storage device and the processor are accommodated, and multiple communication electrodes provided on a bottom surface of the package; and a wiring board having wiring layers comprised of a front surface layer, an intermediate layer and a rear surface layer, each having a wiring pattern formed therein, insulating members for insulating the respective wiring layers from each other; interlayer connection portions each making an electrical connection between the wiring patterns in different ones of the wiring layers; multiple electrode pads formed n the front surface layer; and communication-dedicated interlayer connection portions which are electrically connected to the respective electrode pads, and which are each externally exposed.