A control method of a dishwasher, which has at least two flow paths (F1, F2, F3; F4, F5) provided on one spray arm and having different flow rates and configured to spray washing water to objects to be washed, a chamber (69, 79) having communication holes (656, 657, 658; 755, 757) communicating with the respective flow paths (F1, F2, F3; F4, F5), a water supply pump configured to supply washing water to the chamber (69, 79) through an impeller rotated by a motor, and a flow path switching unit (9; 76) provided within the chamber (69; 79) and configured to sequentially open the communication holes (656, 657, 658; 755, 757) whenever washing water is supplied to the inside of the chamber (69; 79), the control method comprising: measuring the amount of current supplied to the motor while supplying washing water to the chamber (69; 79) by supplying power to the motor; and judging the position of the flow path switching unit (9; 76) by comparing the amount of current measured in the measurement with reference current amounts set to be amounts of current supplied to the motor when washing water is supplied to the respective flow paths (F1, F2, F3; F4, F5), if the amount of current measured in the measurement is not equal to a reference current amount for position judgment set to be one of the reference current amounts, further comprising: intercepting power supplied to the motor for the measurement; and additionally measuring the amount of current supplied to the motor while supplying washing water to the chamber (69; 79) by supplying power to the motor, wherein the interception and the additional measurement are repeated until the amount of current measured in the additional measurement is equal to the reference current amount for position judgment. measuring the amount of current supplied to the motor while supplying washing water to the chamber (69; 79) by supplying power to the motor; and judging the position of the flow path switching unit (9; 76) by comparing the amount of current measured in the measurement with reference current amounts set to be amounts of current supplied to the motor when washing water is supplied to the respective flow paths (F1, F2, F3; F4, F5), if the amount of current measured in the measurement is not equal to a reference current amount for position judgment set to be one of the reference current amounts, further comprising: intercepting power supplied to the motor for the measurement; and additionally measuring the amount of current supplied to the motor while supplying washing water to the chamber (69; 79) by supplying power to the motor, wherein the interception and the additional measurement are repeated until the amount of current measured in the additional measurement is equal to the reference current amount for position judgment. intercepting power supplied to the motor for the measurement; and additionally measuring the amount of current supplied to the motor while supplying washing water to the chamber (69; 79) by supplying power to the motor, wherein the interception and the additional measurement are repeated until the amount of current measured in the additional measurement is equal to the reference current amount for position judgment.