A refrigerator comprising: a cabinet; a door configured to open/close the cabinet and having an opening that is penetrated in a front/rear direction; a transparent panel assembly which is mounted to cover the opening and through which the inside of the refrigerator is seen; and a lighting member provided in the door or the cabinet to brighten a rear side of the transparent panel assembly, wherein the transparent panel assembly comprises: a front panel defining an outer appearance of a front surface; a rear panel defining an outer appearance of a rear surface; a spacer made of a metal material and disposed between the front panel and the rear panel to define a periphery of the transparent panel assembly, the spacer being configured to come into contact with the front panel; a sealant provided to the spacer and configured to form a peripheral surface of the transparent panel assembly between the front panel and the rear panel; a heater (532a, 532) and a heater mounting part on which the heater (532a, 532) is mounted, wherein a surface of the front panel is heated when the heater (532a, 532) generates heat, wherein the sealant is provided between the rear panel and the heater mounting part, characterized in that the heater mounting part is disposed on an outer surface of the spacer and wherein when the heater (532a, 532) generates heat, one side of the front panel, which comes into contact with the spacer, is heated. a cabinet; a door configured to open/close the cabinet and having an opening that is penetrated in a front/rear direction; a transparent panel assembly which is mounted to cover the opening and through which the inside of the refrigerator is seen; and a lighting member provided in the door or the cabinet to brighten a rear side of the transparent panel assembly, wherein the transparent panel assembly comprises: a front panel defining an outer appearance of a front surface; a rear panel defining an outer appearance of a rear surface; a spacer made of a metal material and disposed between the front panel and the rear panel to define a periphery of the transparent panel assembly, the spacer being configured to come into contact with the front panel; a sealant provided to the spacer and configured to form a peripheral surface of the transparent panel assembly between the front panel and the rear panel; a heater (532a, 532) and a heater mounting part on which the heater (532a, 532) is mounted, wherein a surface of the front panel is heated when the heater (532a, 532) generates heat, wherein the sealant is provided between the rear panel and the heater mounting part, characterized in that the heater mounting part is disposed on an outer surface of the spacer and wherein when the heater (532a, 532) generates heat, one side of the front panel, which comes into contact with the spacer, is heated. a front panel defining an outer appearance of a front surface; a rear panel defining an outer appearance of a rear surface; a spacer made of a metal material and disposed between the front panel and the rear panel to define a periphery of the transparent panel assembly, the spacer being configured to come into contact with the front panel; a sealant provided to the spacer and configured to form a peripheral surface of the transparent panel assembly between the front panel and the rear panel; a heater (532a, 532) and a heater mounting part on which the heater (532a, 532) is mounted, wherein a surface of the front panel is heated when the heater (532a, 532) generates heat, wherein the sealant is provided between the rear panel and the heater mounting part, characterized in that the heater mounting part is disposed on an outer surface of the spacer and wherein when the heater (532a, 532) generates heat, one side of the front panel, which comes into contact with the spacer, is heated.