The invention relates to a drain pump capable of reducing an operation noise during a low lift. A drain pump (8) has a pump casing (81) and a blade wheel (82). The pump casing (81) has at the lower end a drainage suction opening (81a) for sucking drain water and has at the side a drainage discharge opening (81b) for discharging the drain water. The blade wheel (82) has a shaft (91) provided so as to vertically extend in the pump casing, a main blade (92) provided on the outer peripheral side of the shaft, an auxiliary blade (94) provided under the main blade, and a circular plate-like receiving dish section (93) provided between the main blade and the auxiliary blade and having an opening section (93a) at the center. The receiving dish section further has an annular partition section (93b) extending upward from the outer peripheral edge of the receiving dish section. The outer peripheral edge of the main blade is positioned at a position lower than the upper end of the partition section and is positioned at the inside circumference surface of the partition section and near the inside circumference.