A control device of a plasma ignition apparatus according to an embodiment includes a plug socket, an oscillation unit, and an amplification unit. The plug socket holds an ignition plug, and a high voltage generated by an ignition coil is transmitted to the ignition plug through the plug socket. The oscillation unit oscillates a high frequency. The amplification unit amplifies the high frequency oscillated by the oscillation unit. The oscillation unit is arranged outside of the plug socket and the amplification unit is arranged inside of the plug socket.