A refrigerator having an ice supply system comprising: a main body having a storage space; a door provided on the main body to open or close the storage space, the door including: an outer door defining a front external appearance of the door; a door liner defining a rear external appearance of the door, a driving motor located on an inner side of the door; a driving connector located on the inner side of the door, movable in rotation by the motor and having interlocking protrusions; an ice maker mounted on an upper part of an installation space (151 S); an ice bank detachably installed to the installation space below the ice maker and an ice maker cover, the ice bank comprising: an ice crushing assembly movable in rotation; a transfer device movable in rotation together with the ice crushing assembly to transfer ice in the ice bank toward an outlet; characterized in that the refrigerator comprises an interlocking connector located on a rear side thereof and movable in rotation together with the ice crushing assembly and the transfer device; and interlocking ribs adapted to engage with the interlocking protrusions of the driving connector when the ice bank is installed in the installation space (151 S), wherein the door liner includes: support steps respectively provided on both side ends of a backside of the door, the support steps configured to protrude rearward by a predetermined length and vertically extend; a connection step configured to protrude rearward by a predetermined length to connect upper ends of the supporting steps; and a seating step horizontally protruding rearward protruding rearward from the backside of the door between the support steps by a predetermined length that is longer than the support steps; wherein the refrigerator further comprises a seating member installed on an area of the backside of the door, the area configured to be defined by the support steps, the connection step and the seating step, wherein the seating member is formed in a shape of a polyhedron with a portion opened to have the installation space (151 S) provided therein; the seating member of the door includes: a front plate defining a front surface of the installation space; both side plates defining both side surfaces of the installation space (151 S); and a bottom plate defining a bottom surface of the installation space, wherein the driving connector is provided at one side of the seating member, the ice maker is fastened to an upper portion of the front plate, and the ice bank is adapted to be inserted in and removed from the installation space (151 S) of the seating member by being rotated and moved in a direction generally perpendicular to the inside of the door. a main body having a storage space; a door provided on the main body to open or close the storage space, the door including: an outer door defining a front external appearance of the door; a door liner defining a rear external appearance of the door, a driving motor located on an inner side of the door; an outer door defining a front external appearance of the door; a door liner defining a rear external appearance of the door, a driving motor located on an inner side of the door; a driving connector located on the inner side of the door, movable in rotation by the motor and having interlocking protrusions; an ice maker mounted on an upper part of an installation space (151 S); an ice bank detachably installed to the installation space below the ice maker and an ice maker cover, the ice bank comprising: an ice crushing assembly movable in rotation; a transfer device movable in rotation together with the ice crushing assembly to transfer ice in the ice bank toward an outlet; characterized in that the refrigerator comprises an interlocking connector located on a rear side thereof and movable in rotation together with the ice crushing assembly and the transfer device; and interlocking ribs adapted to engage with the interlocking protrusions of the driving connector when the ice bank is installed in the installation space (151 S), an ice crushing assembly movable in rotation; a transfer device movable in rotation together with the ice crushing assembly to transfer ice in the ice bank toward an outlet; characterized in that the refrigerator comprises an interlocking connector located on a rear side thereof and movable in rotation together with the ice crushing assembly and the transfer device; and interlocking ribs adapted to engage with the interlocking protrusions of the driving connector when the ice bank is installed in the installation space (151 S), support steps respectively provided on both side ends of a backside of the door, the support steps configured to protrude rearward by a predetermined length and vertically extend; a connection step configured to protrude rearward by a predetermined length to connect upper ends of the supporting steps; and a seating step horizontally protruding rearward protruding rearward from the backside of the door between the support steps by a predetermined length that is longer than the support steps; a front plate defining a front surface of the installation space; both side plates defining both side surfaces of the installation space (151 S); and a bottom plate defining a bottom surface of the installation space, wherein the driving connector is provided at one side of the seating member, the ice maker is fastened to an upper portion of the front plate, and the ice bank is adapted to be inserted in and removed from the installation space (151 S) of the seating member by being rotated and moved in a direction generally perpendicular to the inside of the door.