A refrigerator comprising: a heat exchanger comprising a refrigerant tube in which a refrigerant flows and a heat exchange fin into which the refrigerant tube is inserted; a temperature sensor disposed on an inlet-side or outlet-side of the heat exchanger to detect a temperature of the refrigerant; and a fixing device for fixing a guide tube disposed on an inlet-side or outlet-side of the refrigerant tube and the temperature sensor in a state where the guide tube is in contact with the temperature sensor, wherein the fixing device comprises: - a tube support unit supporting the guide tube, the tube support unit including a tube rib surrounding at least one portion of the guide tube; and - a sensor support unit supporting the temperature sensor, the sensor support unit including a sensor rib extending from the tube support unit to surround at least one portion of the temperature sensor, characterized in that: the fixing device further comprises: - at least one frame comprising a first frame and a second frame spaced apart from each other, and wherein: - a space part in which the guide tube is disposed between the first and second frames (111, 113), - each of the first and second frames (111,113) is rounded to correspond to a shape of the guide tube, and - the tube rib extends from the first frame to support the guide tube, and a sensor rib is coupled to the tube rib and extends from the second frame to support the temperature sensor, - a reinforcing rib extending from a rounded portion of the first frame to a rounded portion of the second frame; and - a guide rib spaced apart from the tube rib and the sensor rib to support a portion of the guide tube that is not in contact with the temperature sensor, the guide rib being configured to extend from the first frame to the second frame and is rounded in a semicircular shape. - a tube support unit supporting the guide tube, the tube support unit including a tube rib surrounding at least one portion of the guide tube; and - a sensor support unit supporting the temperature sensor, the sensor support unit including a sensor rib extending from the tube support unit to surround at least one portion of the temperature sensor, - at least one frame comprising a first frame and a second frame spaced apart from each other, and wherein: - a space part in which the guide tube is disposed between the first and second frames (111, 113), - each of the first and second frames (111,113) is rounded to correspond to a shape of the guide tube, and - the tube rib extends from the first frame to support the guide tube, and a sensor rib is coupled to the tube rib and extends from the second frame to support the temperature sensor, - a space part in which the guide tube is disposed between the first and second frames (111, 113), - each of the first and second frames (111,113) is rounded to correspond to a shape of the guide tube, and - the tube rib extends from the first frame to support the guide tube, and a sensor rib is coupled to the tube rib and extends from the second frame to support the temperature sensor, - a reinforcing rib extending from a rounded portion of the first frame to a rounded portion of the second frame; and - a guide rib spaced apart from the tube rib and the sensor rib to support a portion of the guide tube that is not in contact with the temperature sensor, the guide rib being configured to extend from the first frame to the second frame and is rounded in a semicircular shape.