To provide a nano bubble generator for continuously generating nano bubbles.

The nano bubble generator 1 includes a flow path, a water intake port 101, a pressurizing pump 110, a gas intake amount control valve 120, a bubble water pressurizing tank 130, a pressure-reducing discharge valve 150, a bubble vibrating and crushing path 160, and a discharge port 102. The pressurizing pump 110 sends water containing electrolyte ions by pressurizing to a first pressure. The gas intake amount control valve 120 feeds gas into the flow path. The bubble water pressurizing tank 130 pressurizes the pressurized water and gas to a second pressure lower than the first pressure. The pressure-reducing discharge valve 150 reduces the pressure of the water and gas pressurized to the second pressure. The bubble vibrating and crushing path 160 vibrates the pressure-reduced water and gas. The discharge port 102 discharges the water and gas vibrated by the bubble vibrating and crushing path 160. The diameter of the flow path in the bubble vibrating and crushing path 160 is smaller than the diameter of the flow path between the pressure-reducing discharge valve 150 and bubble vibrating and crushing path 160.

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