A laundry treating apparatus comprising a first treating apparatus for washing laundry, a second treating apparatus for washing laundry, and a third treating apparatus for drying laundry, the first treating apparatus including: a first cabinet provided with a first inlet on an upper surface; a first tub provided inside the first cabinet, for storing water therein; and a first drum rotatably provided inside the first tub, for receiving laundry supplied to the first inlet therein, the second treating apparatus including: a second cabinet provided below the first cabinet, supporting the first cabinet; a drawer provided to be ejected from the second cabinet; a second tub provided inside the drawer, for storing water therein and having a volume smaller than that of the first tub; a second inlet provided on an upper surface of the second tub; and a second drum rotatably provided inside the second tub, for receiving laundry supplied to the second inlet therein, and the third treating apparatus including: a third cabinet provided with a third inlet on a front surface, mounted at a side of the first cabinet and the second cabinet; a third drum rotatably provided inside the third cabinet, providing a space in which laundry supplied to the third inlet is received; and a drying unit for drying the laundry by supplying heated air to the third drum, characterized in that a height of the third treating apparatus is equal to a sum of heights of the first treating apparatus and the second treating apparatus. a first cabinet provided with a first inlet on an upper surface; a first tub provided inside the first cabinet, for storing water therein; and a first drum rotatably provided inside the first tub, for receiving laundry supplied to the first inlet therein, the second treating apparatus including: a second cabinet provided below the first cabinet, supporting the first cabinet; a drawer provided to be ejected from the second cabinet; a second tub provided inside the drawer, for storing water therein and having a volume smaller than that of the first tub; a second inlet provided on an upper surface of the second tub; and a second drum rotatably provided inside the second tub, for receiving laundry supplied to the second inlet therein, and a second cabinet provided below the first cabinet, supporting the first cabinet; a drawer provided to be ejected from the second cabinet; a second tub provided inside the drawer, for storing water therein and having a volume smaller than that of the first tub; a second inlet provided on an upper surface of the second tub; and a second drum rotatably provided inside the second tub, for receiving laundry supplied to the second inlet therein, and the third treating apparatus including: a third cabinet provided with a third inlet on a front surface, mounted at a side of the first cabinet and the second cabinet; a third drum rotatably provided inside the third cabinet, providing a space in which laundry supplied to the third inlet is received; and a drying unit for drying the laundry by supplying heated air to the third drum, characterized in that a height of the third treating apparatus is equal to a sum of heights of the first treating apparatus and the second treating apparatus. a third cabinet provided with a third inlet on a front surface, mounted at a side of the first cabinet and the second cabinet; a third drum rotatably provided inside the third cabinet, providing a space in which laundry supplied to the third inlet is received; and a drying unit for drying the laundry by supplying heated air to the third drum, characterized in that a height of the third treating apparatus is equal to a sum of heights of the first treating apparatus and the second treating apparatus.