PURPOSE: To provide a washing device capable of supplying electrolyzed acidic ion water as washing water without merely supplying usual tap water to a washing nozzle as washing water as it is.

CONSTITUTION: This washing device 1 is constituted of a water supply part 2, an electrolytic cell 3 electrolyzing the water introduced from the water supply part 1 by applying direct voltage across electrodes to form alkali ion water and acidic ion water and a washing water supply means 6 supplying the acidic ion water sent out of the electrolytic cell 3 to a washing nozzle 5 as washing water through a washing water supply passage 4, and the acidic ion water is injected from the washing nozzle.