An ultra-fine bubble generator is provided. The apparatus 10 is provided with the rotary blower 31a, the rotary mixer 11, and the bubble front stage filter 21. The rotary mixer 11 has a cavity 13 having an apex X therein, and an inlet hole 12 and an outlet hole 16 for introducing a fluid. On the inner wall surface of the cavity 13, a spiral groove 14 through which the fluid guided from the inlet hole 12 can flow is provided, and the discharge hole 16 is spirally spaced apart from the apex X of the spiral shape. is provided on the axis of The bubble front filter 21 is provided with a cavity therein, and includes an inlet hole 24 for introducing a fluid into the cavity, and an outlet hole 26 for discharging the fluid. The cavity has a cylindrical shape, and a plurality of plate-shaped thin plates 22 and 23 are disposed perpendicular to their central axis and passing through the central point of the disc, and adjacent thin plates are provided with a plurality of openings and a plurality of tips, and adjacent The tip portion 25a and the opening 25b of the thin plate are disposed to face each other.
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