A refrigerator includes a cabinet, a partition wall partitioning the cabinet, an accommodating unit defining an accommodating space and an opening, where the accommodating space is recessed downward from a horizontal top surface of the partition wall, and the opening is located at an upper portion of the accommodating unit and configured to introduce food therethrough, an accommodating unit door located at the upper portion of the accommodating unit and configured to open and close the opening by moving in a direction parallel to the horizontal top surface, a roller located below the accommodating unit door, where the roller supports the accommodating unit door and allows the accommodating unit door to slidingly move with respect to the partition wall, and an upper rib provided at each of left and right portions of the accommodating unit door and configured to restrict splaying of the accommodating unit door.