A refrigerator comprises: a cabinet (10) providing a storage space; a main door (40) configured to open and close the cabinet (10) and having an opening (401); and a sub door (50) configured to open and close the opening (401) of the main door (40), wherein the main door (40) comprises: a door frame (41) defining the opening (401) and defining a front surface of the main door (40); a door liner (42) coupled to the door frame (41) for providing an insulating space (60) therebetween and defining a rear surface of the main door (40); and an inner frame (43) disposed inside the insulating space (60) along a circumference of the opening (401) of the main door (40) and connecting the door frame (41) to the door liner (42), wherein the inner frame (43) comprises a curved portion (433) in contact with the door liner (42).