PURPOSE: A refrigerator is provided to draw out a second storage box toward the front by mounting a mounting rail, a guide unit and a pull out rail on the second storage box. CONSTITUTION: A refrigerator comprises a storage room and a storage box(50). A mounting rail(37) is formed inside the storage room. The storage box comprises a guide unit and a pullout rail(60). The guide unit is formed on one side of the storage box. The pullout rail is combined with the guide unit and the pullout rail and accepted in the mounting rail. When the storage box enters the storage room or being drawn from the storage room, the storage box moves the mounting rail and the pullout rail.
