IN-VEHICLE CONTROL DEVICE

An in-vehicle control includes a first relay provided between a high-voltage battery and a high-voltage load, a first voltage conversion unit between the first relay and a low-voltage load, a second voltage conversion unit in parallel with the first relay and the first voltage conversion unit and the control unit. The first voltage conversion unit converts a voltage input from the high-voltage battery via the first relay into a low-voltage and outputs the low-voltage to a low-voltage load side. The second voltage conversion unit converts a voltage input from the high-voltage battery into a low-voltage and outputs the low-voltage to the low-voltage load side. The control unit controls the first relay in an ON state, causing the first voltage conversion unit to perform the first conversion operation while the vehicle is traveling, causing the second voltage conversion unit to perform the second conversion operation while the vehicle is parked.