An apparatus 10 for producing water that contains ultra-fine bubbles has: a pressurized water supply system 50 for pressurizing water that contains ultra-fine bubbles produced by suctioning in air from an ejection port 28 using the low pressure that accompanies a current of water jetted from a nozzle 30 and a device 60 for separating out water that contains bubbles, the device 60 comprising a storage-type pressurized-water tank. The device 60 for separating water that contains bubbles has: a pressurized-water inflow port 61 for pumping the pressurized water to an upper part within the tank as a downward swirling flow and allowing the pressurized water to flow into said port 61 a central-part water discharge port 63 for continuously discharging, from the upper end of the tank, water in the central portion of the swirling flow that includes large bubbles collected in the center of the swirling flow and a pressurized-water outlet port 62 for letting out, from the lower part of the tank, water that contains ultra-fine bubbles after the water that contains large bubbles is separated out. The apparatus 10 for producing water that contains ultra-fine bubbles is configured so as to obtain the water that contains ultra-fine bubbles from the pressurized-water outlet port 62.Linvention concerne un appareil (10) pour produire de leau qui contient des bulles ultra-fines, comprenant : un système dalimentation en eau mise sous pression (50) pour mettre sous pression leau qui contient des bulles ultra-fines produites par aspiration dair depuis un orifice déjection (28) à laide de la basse pression qui accompagne un courant deau éjecté depuis une buse (30) et un dispositif (60) pour séparer leau qui contient des bulles, le dispositif (60) comprenant un réservoir deau mise sous pression de type stockage. Le dispositif (60) pour séparer leau qui contient des bulles comporte : un orifice dentrée deau mise sous pression (61) pour pomper leau mise sous pression dans une partie supérieur
