A refrigerator is disclosed. The refrigerator includes a body, a storage chamber defined in the body while having an opened front side, a door to open or close the opened front side of the storage chamber, a water tank to store clean water, a carbonated water production module mounted to a back surface of the door, the carbonated water production module including a carbon dioxide gas cylinder stored with carbon dioxide gas, a carbonated water tank to produce carbonated water through mixing of the clean water with the carbon dioxide gas, and a gas regulator to adjust a pressure of the carbon dioxide gas flowing from the carbon dioxide gas cylinder to the carbonated water tank, and a safety device to selectively move the carbon dioxide gas cylinder toward or away from the gas regulator, thereby coupling or separating the carbon dioxide gas cylinder to or from the gas regulator.
