A refrigerator having a cabinet defining a storage space therein and a door opening and closing the storage space and receiving foods on a back surface thereof, a height-adjustable receiving apparatus mounted on the back surface of the door, wherein the height-adjustable receiving apparatus includes: a receiving member in which the foods are received; a mounting member on which the receiving member is vertically movably mounted, the mounting member being detachably mounted on the back surface of the door; a fixed shaft longitudinally disposed on the mounting member; a rotation gear disposed on the receiving member, the rotation gear configured to rotate to vertically move together with the receiving member along the fixed shaft; a transmission member disposed on the receiving member in a shape of a timing belt which is gear-coupled to the rotation gear; and an operation member coupled to the transmission member and configured to vertically move the receiving member by moving horizontally, characterized in that the receiving member includes an insertion part backwardly protruding from a back surface thereof, the insertion part comprising: an insertion part upper portion extending from the back surface of the receiving member; and an insertion part lower portion extending from the back surface of the receiving member and spaced from the insertion part upper portion, wherein the rotation gear is disposed between the insertion part upper portion and the insertion part lower portion, wherein the mounting member includes an insertion part guide hole in a rear surface thereof to receive the insertion part, wherein the insertion part is placed in the insertion part guide hole, and wherein both ends of the fixed shaft are vertically fixed to upper and lower ends of the insertion part guide hole by sequentially passing through the insertion part and the rotation gear and wherein a guide groove is defined in an outer surface of the fixed shaft such that the rotation gear rotates and vertically moves along the fixed shaft. a receiving member in which the foods are received; a mounting member on which the receiving member is vertically movably mounted, the mounting member being detachably mounted on the back surface of the door; a fixed shaft longitudinally disposed on the mounting member; a rotation gear disposed on the receiving member, the rotation gear configured to rotate to vertically move together with the receiving member along the fixed shaft; a transmission member disposed on the receiving member in a shape of a timing belt which is gear-coupled to the rotation gear; and an operation member coupled to the transmission member and configured to vertically move the receiving member by moving horizontally, characterized in that the receiving member includes an insertion part backwardly protruding from a back surface thereof, the insertion part comprising: an insertion part upper portion extending from the back surface of the receiving member; and an insertion part lower portion extending from the back surface of the receiving member and spaced from the insertion part upper portion, wherein the rotation gear is disposed between the insertion part upper portion and the insertion part lower portion, wherein the mounting member includes an insertion part guide hole in a rear surface thereof to receive the insertion part, wherein the insertion part is placed in the insertion part guide hole, and wherein both ends of the fixed shaft are vertically fixed to upper and lower ends of the insertion part guide hole by sequentially passing through the insertion part and the rotation gear and wherein a guide groove is defined in an outer surface of the fixed shaft such that the rotation gear rotates and vertically moves along the fixed shaft. an insertion part upper portion extending from the back surface of the receiving member; and an insertion part lower portion extending from the back surface of the receiving member and spaced from the insertion part upper portion, wherein the rotation gear is disposed between the insertion part upper portion and the insertion part lower portion, wherein the mounting member includes an insertion part guide hole in a rear surface thereof to receive the insertion part, wherein the insertion part is placed in the insertion part guide hole, and wherein both ends of the fixed shaft are vertically fixed to upper and lower ends of the insertion part guide hole by sequentially passing through the insertion part and the rotation gear and wherein a guide groove is defined in an outer surface of the fixed shaft such that the rotation gear rotates and vertically moves along the fixed shaft.