A refrigerator comprising: a main body defining a storage compartment (20, 30); a light emitting part (17, 87) including a first light emitting part for emitting light to the storage compartment (20, 30); a door (21, 22, 32, 100) selectively opening or closing the storage compartment (20, 30) 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 (21, 22, 32, 100), wherein the sub-door includes a frame and a frontal edge portion constituting a front border of the frame; wherein the door (21, 22, 32, 100) includes: an inner door part allowing light from the light emitting part (17, 87) 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 (17, 87) 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 (17, 87) is turned on and the door (21, 22, 32, 100) is closed, an item inside the storage compartment (20, 30) can be perceived from a frontal viewing of the door through the viewing window. a main body defining a storage compartment (20, 30); a light emitting part (17, 87) including a first light emitting part for emitting light to the storage compartment (20, 30); a door (21, 22, 32, 100) selectively opening or closing the storage compartment (20, 30) 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 (21, 22, 32, 100), wherein the sub-door includes a frame and a frontal edge portion constituting a front border of the frame; wherein the door (21, 22, 32, 100) includes: an inner door part allowing light from the light emitting part (17, 87) 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 (17, 87) 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 (17, 87) is turned on and the door (21, 22, 32, 100) is closed, an item inside the storage compartment (20, 30) 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 (17, 87) 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 (17, 87) 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 (17, 87) is turned on and the door (21, 22, 32, 100) is closed, an item inside the storage compartment (20, 30) can be perceived from a frontal viewing of the door through the viewing window.