To provide a battery charger capable of exchanging communication data by using a commercial power source as a communication medium and a refrigerator provided with the battery charger.

The battery charger has a first plug connected to the commercial AC power source, an AC/DC converting means serially connected to the first plug for converting an alternating current into a direct current, and a second plug connected to the AC/DC converting means. The battery charger is provided with a signal processing means with one end connected to the first plug in parallel with the AC/DC converting means, and another end connected to the second plug.