A dishwasher comprising: a washing container; a sump provided below the washing container, the sump including a first outlet and a second outlet for discharging washing water; an upper nozzle that is disposed at a vertical center portion of the washing container and sprays the washing water supplied from the sump to the washing container; a top nozzle disposed at a vertical upper portion in the washing container and sprays the washing water supplied from the sump to the washing container; a washing water pipe (110, 120) that extends upward from the sump and supplies the washing water to the upper nozzle and the top nozzle; and a lower connector that couples the washing water pipe (110, 120) to the sump, wherein the lower connector includes: a first connecting portion that is coupled to the first outlet and has a first channel for the washing water; and a second connecting portion that is coupled to the second outlet and has a second channel for the washing water, characterized in that the lower connector further comprises: a connector-front portion coupled to the sump; and a connector-rear portion coupled to the washing water pipe (110, 120), wherein hardness of the connector-front portion is higher than hardness of the connector-rear portion, wherein the connector-rear portion includes a clamp coupling portion to which a clamp is coupled and a connector extending portion extending rearward from the clamp coupling portion, and wherein the connector extending portion has a protrusion formed on the outer surface of the connector extending portion. a washing container; a sump provided below the washing container, the sump including a first outlet and a second outlet for discharging washing water; an upper nozzle that is disposed at a vertical center portion of the washing container and sprays the washing water supplied from the sump to the washing container; a top nozzle disposed at a vertical upper portion in the washing container and sprays the washing water supplied from the sump to the washing container; a washing water pipe (110, 120) that extends upward from the sump and supplies the washing water to the upper nozzle and the top nozzle; and a lower connector that couples the washing water pipe (110, 120) to the sump, wherein the lower connector includes: a first connecting portion that is coupled to the first outlet and has a first channel for the washing water; and a second connecting portion that is coupled to the second outlet and has a second channel for the washing water, characterized in that the lower connector further comprises: a connector-front portion coupled to the sump; and a connector-rear portion coupled to the washing water pipe (110, 120), wherein hardness of the connector-front portion is higher than hardness of the connector-rear portion, wherein the connector-rear portion includes a clamp coupling portion to which a clamp is coupled and a connector extending portion extending rearward from the clamp coupling portion, and wherein the connector extending portion has a protrusion formed on the outer surface of the connector extending portion. a first connecting portion that is coupled to the first outlet and has a first channel for the washing water; and a second connecting portion that is coupled to the second outlet and has a second channel for the washing water, characterized in that the lower connector further comprises: a connector-front portion coupled to the sump; and a connector-rear portion coupled to the washing water pipe (110, 120), wherein hardness of the connector-front portion is higher than hardness of the connector-rear portion, wherein the connector-rear portion includes a clamp coupling portion to which a clamp is coupled and a connector extending portion extending rearward from the clamp coupling portion, and wherein the connector extending portion has a protrusion formed on the outer surface of the connector extending portion. a connector-front portion coupled to the sump; and a connector-rear portion coupled to the washing water pipe (110, 120), wherein hardness of the connector-front portion is higher than hardness of the connector-rear portion, wherein the connector-rear portion includes a clamp coupling portion to which a clamp is coupled and a connector extending portion extending rearward from the clamp coupling portion, and wherein the connector extending portion has a protrusion formed on the outer surface of the connector extending portion.