A dryer includes a cabinet that defines an outer appearance of the dryer and has at least one opening, a main drum rotatably disposed in the cabinet and configured to accommodate an object to be dried, a door portion coupled to the cabinet and configured to open and close the opening of the cabinet, and a sub drum rotatably mounted to the door portion and extending toward an inner space of the cabinet. The sub drum defines an accommodation space that is separated from the inner space of the main drum.