A laundry treating apparatus, comprising: a housing; a first wash unit within the housing, the first wash unit comprising a first tub, a first drum mounted inside the first tub, and a first drive unit configured to drive a rotation of the first drum within the first tub; a second wash unit located at an upper side of the first wash unit within the housing, the second wash unit comprising a second tub, a second drum mounted inside the second tub, and a second drive unit configured to drive a rotation of the second drum within the second tub; a valve assembly that is configured to receive tap water and that is configured to control a supply of the tap water to each of the first wash unit and the second wash unit within the housing; characterized in that, at least two supply lines are configured to supply the tap water from the valve assembly to at least two supply points of the second tub in the second wash unit and including a detergent water supply line configured to supply a detergent water comprising a detergent to the second tub and a tap water supply line configured to supply the tap water without detergent to the second tub, wherein the detergent water supply line comprises a plurality of detergent water supply lines, wherein a first detergent water supply line (451, 451a, 451b, 451c, 451d) passes through a detergent storage part (470, 470a, 470b, 470c, 470d) located between the housing and the second tub, wherein a second detergent water supply line (479, 453a, 453b, 453c, 453d) passes through an auxiliary detergent storage part (476, 476a, 476b, 476c, 476d) located between the housing and the second tub, and wherein the detergent water supply line further comprises: a detergent water supply pipe (474, 474a, 474b, 474c, 474d) connecting the detergent storage part (470, 470a, 470b, 470c, 470d) and a sidewall of the second tub; and an auxiliary detergent water supply pipe (478, 478a, 478b, 478c, 478d) connecting the auxiliary detergent storage part (476, 476a, 476b, 476c, 476d) and the sidewall of the second tub. a housing; a first wash unit within the housing, the first wash unit comprising a first tub, a first drum mounted inside the first tub, and a first drive unit configured to drive a rotation of the first drum within the first tub; a second wash unit located at an upper side of the first wash unit within the housing, the second wash unit comprising a second tub, a second drum mounted inside the second tub, and a second drive unit configured to drive a rotation of the second drum within the second tub; a valve assembly that is configured to receive tap water and that is configured to control a supply of the tap water to each of the first wash unit and the second wash unit within the housing; characterized in that, at least two supply lines are configured to supply the tap water from the valve assembly to at least two supply points of the second tub in the second wash unit and including a detergent water supply line configured to supply a detergent water comprising a detergent to the second tub and a tap water supply line configured to supply the tap water without detergent to the second tub, wherein the detergent water supply line comprises a plurality of detergent water supply lines, wherein a first detergent water supply line (451, 451a, 451b, 451c, 451d) passes through a detergent storage part (470, 470a, 470b, 470c, 470d) located between the housing and the second tub, wherein a second detergent water supply line (479, 453a, 453b, 453c, 453d) passes through an auxiliary detergent storage part (476, 476a, 476b, 476c, 476d) located between the housing and the second tub, and wherein the detergent water supply line further comprises: a detergent water supply pipe (474, 474a, 474b, 474c, 474d) connecting the detergent storage part (470, 470a, 470b, 470c, 470d) and a sidewall of the second tub; and an auxiliary detergent water supply pipe (478, 478a, 478b, 478c, 478d) connecting the auxiliary detergent storage part (476, 476a, 476b, 476c, 476d) and the sidewall of the second tub. a detergent water supply pipe (474, 474a, 474b, 474c, 474d) connecting the detergent storage part (470, 470a, 470b, 470c, 470d) and a sidewall of the second tub; and an auxiliary detergent water supply pipe (478, 478a, 478b, 478c, 478d) connecting the auxiliary detergent storage part (476, 476a, 476b, 476c, 476d) and the sidewall of the second tub.