A drain pump, in particular for a laundry treating apparatus, comprising: a housing forming an outer appearance of the drain pump and configured to accommodate water; a first discharge port and a second discharge port formed to protrude from the housing, and positioned apart from each other to form a moving path of the accommodated water; a water flow portion provided with an impeller forming the flow of the water, and formed on an inner circumferential surface of the housing to discharge the accommodated water through the first discharge port or through the second discharge port; a drain pump chamber (19, 410) formed on an inner circumferential surface of the housing to receive or store the water before the water flows into the water flow portion; and an inlet port formed within the housing to protrude toward the water flow portion between the water flow portion and the drain pump chamber (19, 410), wherein a portion of the impeller is formed to be positioned within the inlet port, wherein the impeller comprises: a boss portion coupled to a rotating shaft of a motor providing a driving force for rotating the impeller; a blade portion spaced apart from the boss portion; and a flange portion formed with a plate connecting the boss portion and the blade portion, wherein a protruded end of the inlet port is surrounded by a portion of the impeller, characterized in that a first surface formed by one end of the inlet port is formed closer to the flange portion than a second surface formed by one end of the boss portion on the drain pump chamber side. a housing forming an outer appearance of the drain pump and configured to accommodate water; a first discharge port and a second discharge port formed to protrude from the housing, and positioned apart from each other to form a moving path of the accommodated water; a water flow portion provided with an impeller forming the flow of the water, and formed on an inner circumferential surface of the housing to discharge the accommodated water through the first discharge port or through the second discharge port; a drain pump chamber (19, 410) formed on an inner circumferential surface of the housing to receive or store the water before the water flows into the water flow portion; and an inlet port formed within the housing to protrude toward the water flow portion between the water flow portion and the drain pump chamber (19, 410), wherein a portion of the impeller is formed to be positioned within the inlet port, wherein the impeller comprises: a boss portion coupled to a rotating shaft of a motor providing a driving force for rotating the impeller; a blade portion spaced apart from the boss portion; and a flange portion formed with a plate connecting the boss portion and the blade portion, wherein a protruded end of the inlet port is surrounded by a portion of the impeller, characterized in that a first surface formed by one end of the inlet port is formed closer to the flange portion than a second surface formed by one end of the boss portion on the drain pump chamber side. a boss portion coupled to a rotating shaft of a motor providing a driving force for rotating the impeller; a blade portion spaced apart from the boss portion; and a flange portion formed with a plate connecting the boss portion and the blade portion, wherein a protruded end of the inlet port is surrounded by a portion of the impeller, characterized in that a first surface formed by one end of the inlet port is formed closer to the flange portion than a second surface formed by one end of the boss portion on the drain pump chamber side.