A washing pump comprising: a housing ; a partition wall which vertically divides an inner space of the housing ; an impeller which is rotatably disposed over the partition wall in the housing to cause washing water to flow; a heater which is disposed under the partition wall to heat the washing water in the housing so as to generate steam; a steam discharge pipe which is disposed over the partition wall to discharge the steam, generated by the heater , to an outside of the housing ; a washing water inflow pipe , which is disposed below the partition wall , through which the washing water flows into the housing by rotation of the impeller ; and a washing water outflow pipe , which is disposed over the partition wall , through which the washing water flows out of the housing by rotation of the impeller , wherein the steam discharge pipe is disposed in the washing water outflow pipe on the circumferential surface of the washing water outflow pipe , such that a steam discharge direction is inclined upwardly, wherein the heater is coupled to a bottom of the housing , and a part of the heater is disposed inside the housing and wherein the heater comprises: a heater cover which forms a bottom surface of the housing ; a heating element which is disposed in contact with a lower side of the heater cover to heat the heater cover ; and a heater plate which is disposed in contact with a lower side of the heating element and the heater cover to transfer heat of the heating element to the heater cover . a housing ; a partition wall which vertically divides an inner space of the housing ; an impeller which is rotatably disposed over the partition wall in the housing to cause washing water to flow; a heater which is disposed under the partition wall to heat the washing water in the housing so as to generate steam; a steam discharge pipe which is disposed over the partition wall to discharge the steam, generated by the heater , to an outside of the housing ; a washing water inflow pipe , which is disposed below the partition wall , through which the washing water flows into the housing by rotation of the impeller ; and a washing water outflow pipe , which is disposed over the partition wall , through which the washing water flows out of the housing by rotation of the impeller , wherein the steam discharge pipe is disposed in the washing water outflow pipe on the circumferential surface of the washing water outflow pipe , such that a steam discharge direction is inclined upwardly, wherein the heater is coupled to a bottom of the housing , and a part of the heater is disposed inside the housing and wherein the heater comprises: a heater cover which forms a bottom surface of the housing ; a heating element which is disposed in contact with a lower side of the heater cover to heat the heater cover ; and a heater plate which is disposed in contact with a lower side of the heating element and the heater cover to transfer heat of the heating element to the heater cover . a heater cover which forms a bottom surface of the housing ; a heating element which is disposed in contact with a lower side of the heater cover to heat the heater cover ; and a heater plate which is disposed in contact with a lower side of the heating element and the heater cover to transfer heat of the heating element to the heater cover . <EOS>