Fine bubble generating device that uses swirling flow generation by pressurized liquid injection and has a simple structure and structure, and is excellent in handling, operability, and durability, and a fine bubble generating method that can generate a large amount of bubbles, A shower device and an oil / water separator having the fine bubble generating device are also provided. The fine bubble generating apparatus of the present invention includes a cylindrical or conical cylinder having a gas-liquid swirl chamber therein, a gas-liquid projecting port provided on one side of the cylindrical or conical cylinder, and the gas-liquid swirl An end portion having a liquid supply cylinder and a gas supply cylinder each having an introduction port for introducing liquid and gas into the room and closed as one side of the columnar or conical cylinder as the gas-liquid projecting opening A plurality of small cylindrical through-holes are provided on the wall surface, or the circumferential surface of the end inner wall opened on one side of the columnar or conical cylinder has a circular cross section and a semicircle or more A plurality of small recesses having a circumferential length are provided.
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