A relay control device controls an operation of a relay circuit, which is disposed between a battery and an electric load, and the relay circuit is sealed in a case of a battery pack. The relay circuit includes: a first main relay disposed in a first conduction path which is connected to a first terminal of the battery; a second main relay disposed in a second conduction path which is connected to a second terminal of the battery; and a pre-charge relay connected to the second conduction path in parallel with the second main relay. The relay control device turns on the pre-charge relay, the first main relay, and the second main relay in order, and then turns off the pre-charge relay, the first main relay, and the second main relay in order.