A refrigerator having an ice-making device, 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, 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 the backside of the door by a predetermined length and to extend vertically, the seating step being formed to extend from 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, two 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 a lower end of the front plate, and having a bottom side brought into contact with a top side of the seating step, further comprising an ice maker cover detachably installed in the installation space, 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 a catching rib is provided on the front side of the installation space, and positioned adjacent to the upper end of the rear side of the ice bank for preventing inadvertent detachment of the ice bank from the installation space. 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, 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 the backside of the door by a predetermined length and to extend vertically, the seating step being formed to extend from 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, two 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 a lower end of the front plate, and having a bottom side brought into contact with a top side of the seating step, an ice maker, 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 the backside of the door by a predetermined length and to extend vertically, the seating step being formed to extend from 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, two 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 a lower end of the front plate, and having a bottom side brought into contact with a top side of the seating step, a front plate having a backside brought into contact with the backside of the door between the support steps, two 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 a lower end of the front plate, and having a bottom side brought into contact with a top side of the seating step, further comprising an ice maker cover detachably installed in the installation space, 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 a catching rib is provided on the front side of the installation space, and positioned adjacent to the upper end of the rear side of the ice bank for preventing inadvertent detachment of the ice bank from the installation space.