To provide a control unit of plug-in vehicle that properly notifies a user of the causes of failure caused during charging without causing power consumption larger than necessary.

The control unit of plug-in vehicle for charging a high-voltage battery 150 via a charge cable 300 includes a storage section for storing control information and a system control unit that selectively executes either first power supply control for supplying control power to a first feeder 6b to which a first control section including a notifying device 13 for notifying a state of a vehicle is connected, and second power supply control for supplying control power to a second feeder 6a to which a second control section for charging the high-voltage battery 150 is connected, and executes state notification control for further executing the first power supply control for a predetermined time at second power supply control to cause the notifying device to transmit information on charging.