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 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 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. <EOS>