PROBLEM TO BE SOLVED: To provide a fine air bubble generator attached to liquid supply piping to be used and capable of generating fine air bubbles in high density by simple constitution.
SOLUTION: The fine air bubble generator 10 attached to the leading end part of the liquid supply piping 12 to be used is configured to include a throttle part 15 for contracting the diameter of the flow channel 14 from the liquid supply piping 12, a diffuser part 16 arranged downstream of the throttle part 15 and constituted so that the inner diameter of the inner wall surface 16a thereof is expanded toward downstream of the throttle part 15 and an air chamber part 18 for supplying air to the interval part 26 between the throttle part 15 and the diffuser part 16. A barrier plate continuously provided plate 19, wherein a plurality of barrier plates 21 and flow openings 22 are continuously provided in a discharge direction X, is provided to the cross-sectional central part of the diffuser part 16 in a state that intervals S1, S2 and S3 are held between the barrier plates 21 and the inner wall surface 16a of the diffuser part 16.
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