A refrigerator having a first storage box inserted and withdrawn like a drawer in association with a door, a second storage box seated and rolled on an upper part of the first storage box, and a roller device to enable the rolling motion of the second storage box on the first storage box. The roller device includes a first roller member mounted to the second storage box, a first roller supporting part formed at the first storage box to support a rolling motion of the first roller member thereon, a second roller member mounted to the first storage box, and a second roller supporting part formed at the second storage box to support the rolling motion of the second roller member thereon. The second storage box may be smoothly moved since the load of the second storage box is distributed to the first and second roller members.