A refrigerator comprising: an inner cabinet to define a storage compartment having a front opening; a door to open or close the opening; item storage units arranged in multiple layers, the item storage units being accommodated in the storage compartment and allowing items to be placed thereon; horizontal frames arranged in multiple layers; a vertical frame coupled to each of the horizontal frames arranged in multiple layers, the vertical frame extending vertically; first rail units arranged in multiple layers, the first rail units supporting the horizontal frames so that the horizontal frames are movable in a front-to-back direction relative to the storage compartment; and a link to connect any one of the horizontal frames arranged in multiple layers and the door to each other so as to move the horizontal frames in the front-to-back direction in response to rotation of the door; characterized in that the item storage units are arranged on the horizontal frames to be moveably supported by the horizontal frames, respectively; the first rail units include support units secured to a side surface of the storage compartment, wherein the support units are arranged in multiple layers so as to correspond to the respective horizontal frames, and wherein the support unit directly supports the corresponding horizontal frame movably and receives the load of the corresponding item storage unit and the horizontal frame, and further comprising: a second rail unit (36, 38) located between the item storage unit and the horizontal frame arranged in the same layer so as to movably support the item storage unit in the front-to-back direction. an inner cabinet to define a storage compartment having a front opening; a door to open or close the opening; item storage units arranged in multiple layers, the item storage units being accommodated in the storage compartment and allowing items to be placed thereon; horizontal frames arranged in multiple layers; a vertical frame coupled to each of the horizontal frames arranged in multiple layers, the vertical frame extending vertically; first rail units arranged in multiple layers, the first rail units supporting the horizontal frames so that the horizontal frames are movable in a front-to-back direction relative to the storage compartment; and a link to connect any one of the horizontal frames arranged in multiple layers and the door to each other so as to move the horizontal frames in the front-to-back direction in response to rotation of the door; characterized in that the item storage units are arranged on the horizontal frames to be moveably supported by the horizontal frames, respectively; the first rail units include support units secured to a side surface of the storage compartment, wherein the support units are arranged in multiple layers so as to correspond to the respective horizontal frames, and wherein the support unit directly supports the corresponding horizontal frame movably and receives the load of the corresponding item storage unit and the horizontal frame, and further comprising: a second rail unit (36, 38) located between the item storage unit and the horizontal frame arranged in the same layer so as to movably support the item storage unit in the front-to-back direction.