A refrigerator comprising: a cabinet having a storage compartment defined therein; a door for opening and closing the storage compartment ; and a water tank for supplying water to a user, wherein the water tank comprises: a storage unit for storing water; a valve for supplying the water stored in the storage unit to the user; and a cover for opening and closing the storage unit , characterized in that the water tank is provided at an inside of the door and in that the cover comprises : a cover support part protruding to one side such that the cover support part is supported at an upper side of the storage unit ; and the cover further comprises: a main cover ; and an auxiliary cover fastened to a lower part of the main cover , a hollow part being defined therein and defined by the main cover and the auxiliary cover , a gasket comprising a protrusion protruding toward an inside wall of the storage unit , and a body provided in the hollow part , the body being connected to the protrusion . a cabinet having a storage compartment defined therein; a door for opening and closing the storage compartment ; and a water tank for supplying water to a user, wherein the water tank comprises: a storage unit for storing water; a valve for supplying the water stored in the storage unit to the user; and a cover for opening and closing the storage unit , characterized in that the water tank is provided at an inside of the door and in that the cover comprises : a cover support part protruding to one side such that the cover support part is supported at an upper side of the storage unit ; and the cover further comprises: a main cover ; and an auxiliary cover fastened to a lower part of the main cover , a hollow part being defined therein and defined by the main cover and the auxiliary cover , a gasket comprising a protrusion protruding toward an inside wall of the storage unit , and a body provided in the hollow part , the body being connected to the protrusion . a storage unit for storing water; a valve for supplying the water stored in the storage unit to the user; and a cover for opening and closing the storage unit , characterized in that the water tank is provided at an inside of the door and in that the cover comprises : a cover support part protruding to one side such that the cover support part is supported at an upper side of the storage unit ; and the cover further comprises: a main cover ; and an auxiliary cover fastened to a lower part of the main cover , a hollow part being defined therein and defined by the main cover and the auxiliary cover , a gasket comprising a protrusion protruding toward an inside wall of the storage unit , and a body provided in the hollow part , the body being connected to the protrusion . a cover support part protruding to one side such that the cover support part is supported at an upper side of the storage unit ; and the cover further comprises: a main cover ; and an auxiliary cover fastened to a lower part of the main cover , a hollow part being defined therein and defined by the main cover and the auxiliary cover , a gasket comprising a protrusion protruding toward an inside wall of the storage unit , and a body provided in the hollow part , the body being connected to the protrusion . a main cover ; and an auxiliary cover fastened to a lower part of the main cover , a hollow part being defined therein and defined by the main cover and the auxiliary cover , a gasket comprising a protrusion protruding toward an inside wall of the storage unit , and a body provided in the hollow part , the body being connected to the protrusion . <EOS>