An apparatus comprising a main body with an inside wall, the apparatus further comprising a slide rail locking device and a supporting bar, the slide rail locking device being for coupling the supporting bar mountable on an inside wall of the main body to a slide rail fixed to a side surface or a bottom surface of a drawer, wherein the slide rail locking device comprises: an upper locking plate located above the supporting bar, and lockable to a slide rail; a lower locking plate located below the supporting bar; a connection plate connecting the upper locking plate and the lower locking plate to each other; and an extended plate formed by being bulged down from the lower locking plate to face the upper locking plate,and wherein the supporting bar includes: a plurality of horizontal supporting bars; and a plurality of vertical supporting bars disposed perpendicular to the plurality of horizontal supporting bars, with opposite ends of the plurality of horizontal supporting bars being fixed thereto, and the horizontal supporting bars including a plurality of fixing parts disposed in parallel with each other, with first ends thereof being mounted perpendicular to the vertical supporting bars and toward the inside of the main body, wherein a gap is formed to separate the upper locking plate, the lower locking plate, and the connection plate from the vertical supporting bar by a predetermined distance, characterized in that the slide rail locking device is formed such that the upper locking plate, the lower locking plate and the connection plate surround the fixing parts. the slide rail locking device being for coupling the supporting bar mountable on an inside wall of the main body to a slide rail fixed to a side surface or a bottom surface of a drawer, wherein the slide rail locking device comprises: an upper locking plate located above the supporting bar, and lockable to a slide rail; a lower locking plate located below the supporting bar; a connection plate connecting the upper locking plate and the lower locking plate to each other; and an extended plate formed by being bulged down from the lower locking plate to face the upper locking plate,and an upper locking plate located above the supporting bar, and lockable to a slide rail; a lower locking plate located below the supporting bar; a connection plate connecting the upper locking plate and the lower locking plate to each other; and an extended plate formed by being bulged down from the lower locking plate to face the upper locking plate,and wherein the supporting bar includes: a plurality of horizontal supporting bars; and a plurality of vertical supporting bars disposed perpendicular to the plurality of horizontal supporting bars, with opposite ends of the plurality of horizontal supporting bars being fixed thereto, and a plurality of horizontal supporting bars; and a plurality of vertical supporting bars disposed perpendicular to the plurality of horizontal supporting bars, with opposite ends of the plurality of horizontal supporting bars being fixed thereto, and the horizontal supporting bars including a plurality of fixing parts disposed in parallel with each other, with first ends thereof being mounted perpendicular to the vertical supporting bars and toward the inside of the main body, wherein a gap is formed to separate the upper locking plate, the lower locking plate, and the connection plate from the vertical supporting bar by a predetermined distance, characterized in that the slide rail locking device is formed such that the upper locking plate, the lower locking plate and the connection plate surround the fixing parts.