PROBLEM TO BE SOLVED: To provide a washing system which washes clothing and the like without using a detergent, with a simple structure.SOLUTION: A washing system 1 includes: an alkali ion water generation part 10； an alkali ion water generation medium supply part 20 for supplying an alkali ion water generation medium 21 to the alkali ion water generation part； an alkali ion water storage part 30 for storing the alkali ion water generated in the alkali ion water generation part； a washing tank 200 for washing a washing object； and a control valve 40 at a third pipeline 52 for connecting the washing tank from the alkali ion water storage part. By controlling the ratio of the amount of water to the alkali ion water, in the washing tank, washing can be performed with hydrogen ion concentration suitable for the washing object such as clothing.SELECTED DRAWING: Figure 1
