A refrigerator comprising: a main body defining a storage compartment ; a light emitting part including a first light emitting part for emitting light to the storage compartment ; a door selectively opening or closing the storage compartment and provided with a viewing window for viewing an inside of the storage compartment from an outside; and a sub-door for receiving an item and being disposed behind the door , wherein the sub-door includes a frame and a frontal edge portion constituting a front border of the frame ; wherein the door includes: an inner door part allowing light from the light emitting part to pass therethrough; an outer door part allowing light passing through the inner door part to pass therethrough and provided with the viewing window ; and a space between the inner door part and the outer door part filled with gas for insulation, wherein the light emitting part includes a second light emitting part provided at an inner surface of the frontal edge portion of the sub-door and configured to emit light to a center of the sub-door , and wherein, when the light emitting part is turned on and the door is closed, an item inside the storage compartment can be perceived from a frontal viewing of the door through the viewing window . a main body defining a storage compartment ; a light emitting part including a first light emitting part for emitting light to the storage compartment ; a door selectively opening or closing the storage compartment and provided with a viewing window for viewing an inside of the storage compartment from an outside; and a sub-door for receiving an item and being disposed behind the door , wherein the sub-door includes a frame and a frontal edge portion constituting a front border of the frame ; wherein the door includes: an inner door part allowing light from the light emitting part to pass therethrough; an outer door part allowing light passing through the inner door part to pass therethrough and provided with the viewing window ; and a space between the inner door part and the outer door part filled with gas for insulation, wherein the light emitting part includes a second light emitting part provided at an inner surface of the frontal edge portion of the sub-door and configured to emit light to a center of the sub-door , and wherein, when the light emitting part is turned on and the door is closed, an item inside the storage compartment can be perceived from a frontal viewing of the door through the viewing window . an inner door part allowing light from the light emitting part to pass therethrough; an outer door part allowing light passing through the inner door part to pass therethrough and provided with the viewing window ; and a space between the inner door part and the outer door part filled with gas for insulation, wherein the light emitting part includes a second light emitting part provided at an inner surface of the frontal edge portion of the sub-door and configured to emit light to a center of the sub-door , and wherein, when the light emitting part is turned on and the door is closed, an item inside the storage compartment can be perceived from a frontal viewing of the door through the viewing window . <EOS>