A refrigerator includes a cabinet including a storage space; a main door to open and close the cabinet and defining an opening; and a sub door defining a front surface of the refrigerator and to open and close the opening of the main door. The main door includes a door frame defining the opening and contacting the sub door; a door liner coupled to the door frame to form an insulating space and defining a rear surface of the main door; and an inner frame defined along the opening of the main door inside of the insulating space and to support between the door frame and the door liner, where the inner frame includes a curved portion defined at a rear side of the inner frame, which connects to the door liner.