An ice-making device for a refrigerator, including: a main body having a storage space; and a door selectively opening or closing the storage space, the ice-making device comprising: an ice maker installed on a backside of the door and making ice; and a seating member installed in a space, which is defined by the backside of the door, side surfaces of a pair of support steps facing each other and a seating step, the support steps being formed to protrude rearward from both side ends of the backside of the door by a predetermined length and to extend vertically, the seating step being formed to extend from side to side in such a manner that a portion of the backside of the door between the support steps protrudes rearward by a predetermined length, the seating member being provided with an installation space in which the ice maker is installed, wherein the seating member includes a front plate having a backside brought into contact with the backside of the door between the support steps, both side plates provided on both side ends of the front plate and having outer surfaces brought into contact with side surfaces of the support steps facing each other, respectively, and a bottom plate provided on lower ends of the front and side plates, and having a bottom side brought into contact with a top side of the seating step, further comprising an ice maker cover detachably installed on the backside of the door to selectively open or close the ice maker, an ice bank detachably installed in the installation space below the ice maker, the ice bank storing ice made in the ice maker and transferring it to a dispenser provided on the door, wherein in a state where the ice bank is installed in the installation space, the upper end circumference of the ice bank spaced apart by a predetermined distance from the underside of the ice maker and the lower end circumference of the ice maker cover. a main body having a storage space; and a door selectively opening or closing the storage space, the ice-making device comprising: an ice maker installed on a backside of the door and making ice; and a seating member installed in a space, which is defined by the backside of the door, side surfaces of a pair of support steps facing each other and a seating step, the support steps being formed to protrude rearward from both side ends of the backside of the door by a predetermined length and to extend vertically, the seating step being formed to extend from side to side in such a manner that a portion of the backside of the door between the support steps protrudes rearward by a predetermined length, the seating member being provided with an installation space in which the ice maker is installed, wherein the seating member includes a front plate having a backside brought into contact with the backside of the door between the support steps, both side plates provided on both side ends of the front plate and having outer surfaces brought into contact with side surfaces of the support steps facing each other, respectively, and a bottom plate provided on lower ends of the front and side plates, and having a bottom side brought into contact with a top side of the seating step, further comprising an ice maker cover detachably installed on the backside of the door to selectively open or close the ice maker, an ice bank detachably installed in the installation space below the ice maker, the ice bank storing ice made in the ice maker and transferring it to a dispenser provided on the door, wherein in a state where the ice bank is installed in the installation space, the upper end circumference of the ice bank spaced apart by a predetermined distance from the underside of the ice maker and the lower end circumference of the ice maker cover. an ice maker installed on a backside of the door and making ice; and a seating member installed in a space, which is defined by the backside of the door, side surfaces of a pair of support steps facing each other and a seating step, the support steps being formed to protrude rearward from both side ends of the backside of the door by a predetermined length and to extend vertically, the seating step being formed to extend from side to side in such a manner that a portion of the backside of the door between the support steps protrudes rearward by a predetermined length, the seating member being provided with an installation space in which the ice maker is installed, wherein the seating member includes a front plate having a backside brought into contact with the backside of the door between the support steps, both side plates provided on both side ends of the front plate and having outer surfaces brought into contact with side surfaces of the support steps facing each other, respectively, and a bottom plate provided on lower ends of the front and side plates, and having a bottom side brought into contact with a top side of the seating step, further comprising an ice maker cover detachably installed on the backside of the door to selectively open or close the ice maker, an ice bank detachably installed in the installation space below the ice maker, the ice bank storing ice made in the ice maker and transferring it to a dispenser provided on the door, wherein in a state where the ice bank is installed in the installation space, the upper end circumference of the ice bank spaced apart by a predetermined distance from the underside of the ice maker and the lower end circumference of the ice maker cover.