Air bubbles in a liquid is atomized or pulverized into finer air bubbles by obliquely injecting one air bubble liquid containing air bubbles from a primary injection hole into a production cylinder having an upstream end closed and a downstream end opening to form a primary swirling liquid flow and simultaneously injecting another air bubble liquid containing air bubbles from a secondary injection hole into the production cylinder to form a secondary swirling liquid flow so as to bring the secondary swirling liquid flow into collision with the primary swirling liquid flow, consequently to atomize the air bubbles in the air bubble liquid to further fine air bubbles. The air-bubble atomizing device capable of atomizing or pulverizing the air bubbles in the liquid in such a manner is useful for separating lipids contained in waste liquid, performing surplus sludge treatment and other various industrial purposes.
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