A washing machine comprising: a cabinet having a detergent supplier; a tub arranged in the cabinet to be connected to the detergent supplier and containing mixing water in which washing water supplied to the detergent supplier and a powder detergent are mixed; a drum rotatably installed in the tub; a circulation hose connecting between the tub and the drum for the mixing water contained in a lower portion of the tub to be circulated; a detergent dissolution device generating vortex current in mixing water circulated through the circulation hose to improve solubility of the powder detergent; and a circulation pump arranged in the circulation hose and configured to repeatedly supply and discharge mixing water to and from the detergent dissolution device through on/off controlling, wherein the detergent dissolution device is arranged at a higher location than the circulation pump, and the washing machine is configured that: when the circulation pump is controlled to be on, mixing water contained in a lower portion of the tub is supplied to the detergent dissolution device through the circulation hose and mixing water supplied to the detergent dissolution device is supplied to the drum with improved solubility of the powder detergent by the vortex current generated in the detergent dissolution device, and when the circulation pump is controlled to be off, mixing water supplied into the detergent dissolution device is discharged by gravity toward the circulation pump from the detergent dissolution device, wherein the circulation hose comprises a first circulation hose connecting the tub to the circulation pump, a third circulation hose connecting the detergent dissolution device to the drum and characterized in that the circulation hose comprises a second circulation hose connecting the circulation pump to the detergent dissolution device. a cabinet having a detergent supplier; a tub arranged in the cabinet to be connected to the detergent supplier and containing mixing water in which washing water supplied to the detergent supplier and a powder detergent are mixed; a drum rotatably installed in the tub; a circulation hose connecting between the tub and the drum for the mixing water contained in a lower portion of the tub to be circulated; a detergent dissolution device generating vortex current in mixing water circulated through the circulation hose to improve solubility of the powder detergent; and a circulation pump arranged in the circulation hose and configured to repeatedly supply and discharge mixing water to and from the detergent dissolution device through on/off controlling, wherein the detergent dissolution device is arranged at a higher location than the circulation pump, and the washing machine is configured that: when the circulation pump is controlled to be on, mixing water contained in a lower portion of the tub is supplied to the detergent dissolution device through the circulation hose and mixing water supplied to the detergent dissolution device is supplied to the drum with improved solubility of the powder detergent by the vortex current generated in the detergent dissolution device, and when the circulation pump is controlled to be off, mixing water supplied into the detergent dissolution device is discharged by gravity toward the circulation pump from the detergent dissolution device, wherein the circulation hose comprises a first circulation hose connecting the tub to the circulation pump, a third circulation hose connecting the detergent dissolution device to the drum and characterized in that the circulation hose comprises a second circulation hose connecting the circulation pump to the detergent dissolution device. when the circulation pump is controlled to be on, mixing water contained in a lower portion of the tub is supplied to the detergent dissolution device through the circulation hose and mixing water supplied to the detergent dissolution device is supplied to the drum with improved solubility of the powder detergent by the vortex current generated in the detergent dissolution device, and when the circulation pump is controlled to be off, mixing water supplied into the detergent dissolution device is discharged by gravity toward the circulation pump from the detergent dissolution device, wherein the circulation hose comprises a first circulation hose connecting the tub to the circulation pump, a third circulation hose connecting the detergent dissolution device to the drum and characterized in that the circulation hose comprises a second circulation hose connecting the circulation pump to the detergent dissolution device.