A laundry treatment apparatus comprising: a cabinet including an introduction opening through which laundry is introduced into the apparatus; a drum rotatably disposed in the cabinet and including a drum inlet provided at a front side thereof, the drum inlet communicating with the introduction opening; at least three balancers fixed to the drum such that they are spaced apart from one another by regular angular intervals around a rotational center of the drum, each of the at least three balancers being divided into a front chamber close to the front side of the drum and a rear chamber close to a rear side of the drum for accommodation of liquid and including a pipe-shaped guide channel member for guiding liquid to the rear chamber; a channel unit comprising a first channel member for supplying liquid to the front chambers of the balancers and a second channel member for supplying liquid to the guide channel members of the balancers; a sensing unit for detecting a position of the laundry causing an unbalance of the drum; a supply unit capable of concurrently supplying liquid to both the first and second channel members (51, 52) or selectively supplying liquid to one of the first and second channel members (51, 52), and a control unit configured to make the supply unit supply water concurrently or selectively to the first and second channel members (51, 52) on the basis of a signal detected by the sensing unit to resolve the unbalance of the drum, characterized in that the channel unit further comprise a base body provided along an outer circumferential surface of the drum inlet and fixed to the front side of the drum; and a base flange extending from the base body toward the introduction opening, wherein the first channel member comprises: a first channel body extending from the base body toward the introduction opening; and a first flange extending inwardly and then toward the base flange from the first channel body, and wherein the second channel member comprises: a second channel body extending from the base body toward the introduction opening; and a second flange extending inwardly and then toward the first channel body from the second channel body. a cabinet including an introduction opening through which laundry is introduced into the apparatus; a drum rotatably disposed in the cabinet and including a drum inlet provided at a front side thereof, the drum inlet communicating with the introduction opening; at least three balancers fixed to the drum such that they are spaced apart from one another by regular angular intervals around a rotational center of the drum, each of the at least three balancers being divided into a front chamber close to the front side of the drum and a rear chamber close to a rear side of the drum for accommodation of liquid and including a pipe-shaped guide channel member for guiding liquid to the rear chamber; a channel unit comprising a first channel member for supplying liquid to the front chambers of the balancers and a second channel member for supplying liquid to the guide channel members of the balancers; a sensing unit for detecting a position of the laundry causing an unbalance of the drum; a supply unit capable of concurrently supplying liquid to both the first and second channel members (51, 52) or selectively supplying liquid to one of the first and second channel members (51, 52), and a control unit configured to make the supply unit supply water concurrently or selectively to the first and second channel members (51, 52) on the basis of a signal detected by the sensing unit to resolve the unbalance of the drum, characterized in that the channel unit further comprise a base body provided along an outer circumferential surface of the drum inlet and fixed to the front side of the drum; and a base flange extending from the base body toward the introduction opening, wherein the first channel member comprises: a first channel body extending from the base body toward the introduction opening; and a first flange extending inwardly and then toward the base flange from the first channel body, and a first channel body extending from the base body toward the introduction opening; and a first flange extending inwardly and then toward the base flange from the first channel body, and wherein the second channel member comprises: a second channel body extending from the base body toward the introduction opening; and a second flange extending inwardly and then toward the first channel body from the second channel body. a second channel body extending from the base body toward the introduction opening; and a second flange extending inwardly and then toward the first channel body from the second channel body.