A refrigerator is provided that may include a main body having a storage compartment in which food or other items may be stored, a main door configured to open or close the storage compartment, the main door having a storage chamber separate from the storage compartment, a sub door configured to open or close an opening of the storage chamber, a tray configured to be introduced into or withdrawn from the storage chamber, a guide configured to guide movement of the tray by being compressed when the tray is introduced into the storage chamber and released from compression when the tray is withdrawn from the storage chamber, and a basket placed on the tray, the basket having a storage space therein. The guide may cause variation in a moving speed of the tray when the tray is introduced into or withdrawn from the storage chamber.