A refrigerator comprising: a refrigerating compartment; and a water tank disposed in the refrigerating compartment, wherein the water tank comprises: a tank body; a plurality of tank caps comprising a cap flange, and covering both opened sides of the tank body, and each of which has a hemispherical shape; a water inlet tube; a water outlet tube; wherein the tank body is horizontally disposed with respect to a bottom surface of the refrigerating compartment so that the water outlet tube is disposed in an upper portion of the tank body; characterized in that the water tank is formed of a stainless material, the tank body is manufactured by welding a contact end of a plate formed of a stainless material, which is wound in a cylindrical shape, the tank body having body flanges on both sides thereof, the cap flange of the respective tank cap is coupled to contact the body flange and is formed of a stainless material, the water inlet tube is welded and coupled after passing through one tank cap of the plurality of tank caps, and the water outlet tube is welded and coupled to the tank body after passing through the tank body. a refrigerating compartment; and a water tank disposed in the refrigerating compartment, wherein the water tank comprises: a tank body; a plurality of tank caps comprising a cap flange, and covering both opened sides of the tank body, and each of which has a hemispherical shape; a water inlet tube; a water outlet tube; wherein the tank body is horizontally disposed with respect to a bottom surface of the refrigerating compartment so that the water outlet tube is disposed in an upper portion of the tank body; characterized in that the water tank is formed of a stainless material, the tank body is manufactured by welding a contact end of a plate formed of a stainless material, which is wound in a cylindrical shape, the tank body having body flanges on both sides thereof, the cap flange of the respective tank cap is coupled to contact the body flange and is formed of a stainless material, the water inlet tube is welded and coupled after passing through one tank cap of the plurality of tank caps, and the water outlet tube is welded and coupled to the tank body after passing through the tank body. a tank body; a plurality of tank caps comprising a cap flange, and covering both opened sides of the tank body, and each of which has a hemispherical shape; a water inlet tube; a water outlet tube; wherein the tank body is horizontally disposed with respect to a bottom surface of the refrigerating compartment so that the water outlet tube is disposed in an upper portion of the tank body; characterized in that the water tank is formed of a stainless material, the tank body is manufactured by welding a contact end of a plate formed of a stainless material, which is wound in a cylindrical shape, the tank body having body flanges on both sides thereof, the cap flange of the respective tank cap is coupled to contact the body flange and is formed of a stainless material, the water inlet tube is welded and coupled after passing through one tank cap of the plurality of tank caps, and the water outlet tube is welded and coupled to the tank body after passing through the tank body.