A refrigerator comprising: a cabinet defining a storage space; a main door configured to open and close the cabinet, the main door having a first opening; a sub door configured to open and close the opening of the main door, the sub door having a second opening; an inner frame provided at a periphery of the second opening of the sub door; a transparent display assembly fixed to the sub door by the inner frame, the transparent display assembly comprising: a front panel and a rear panel; an outer spacer provided between the front panel and the rear panel, wherein a sealed space is defined by the front panel, the rear panel and the outer spacer; a display provided within the sealed space; a display cable configured to be electrically connected to the display and extended to outside of the transparent display assembly; a docking printed circuit board provided on an upper portion of the transparent display assembly, the docking printed circuit board being electrically connected to the display cable; and a connection cable connected to the docking printed circuit board, the connection cable being connected to a control unit of the cabinet through an upper hinge (401,501) of the sub door, characterized in that the inner frame comprises a barrier part extended from an upper portion of the inner frame to a cap deco that defines a top surface of the sub door, the barrier part being configured to partition a space between the outer plate and the door liner of an upper portion of the sub door into a first space and a second space in which the docking printed circuit board is provided, wherein the second space and the docking printed circuit board are provided above the transparent display assembly, and wherein the display is connected with the docking PCB by the display cable, the display cable including a flexible flat cable and being guided to the outside of the outer spacer through the space between the rear panel and the outer spacer. a cabinet defining a storage space; a main door configured to open and close the cabinet, the main door having a first opening; a sub door configured to open and close the opening of the main door, the sub door having a second opening; an inner frame provided at a periphery of the second opening of the sub door; a transparent display assembly fixed to the sub door by the inner frame, the transparent display assembly comprising: a front panel and a rear panel; an outer spacer provided between the front panel and the rear panel, wherein a sealed space is defined by the front panel, the rear panel and the outer spacer; a display provided within the sealed space; a front panel and a rear panel; an outer spacer provided between the front panel and the rear panel, wherein a sealed space is defined by the front panel, the rear panel and the outer spacer; a display provided within the sealed space; a display cable configured to be electrically connected to the display and extended to outside of the transparent display assembly; a docking printed circuit board provided on an upper portion of the transparent display assembly, the docking printed circuit board being electrically connected to the display cable; and a connection cable connected to the docking printed circuit board, the connection cable being connected to a control unit of the cabinet through an upper hinge (401,501) of the sub door, characterized in that the inner frame comprises a barrier part extended from an upper portion of the inner frame to a cap deco that defines a top surface of the sub door, the barrier part being configured to partition a space between the outer plate and the door liner of an upper portion of the sub door into a first space and a second space in which the docking printed circuit board is provided, wherein the second space and the docking printed circuit board are provided above the transparent display assembly, and wherein the display is connected with the docking PCB by the display cable, the display cable including a flexible flat cable and being guided to the outside of the outer spacer through the space between the rear panel and the outer spacer.