PROBLEM TO BE SOLVED: To provide a microbubble generator for generating microbubbles with a comparatively simple structure.SOLUTION: The microbubble generator includes a microbubble jet base 10 and a casing 20 fixing the microbubble jet base 10. The jet direction outside surface of the microbubble jet base 10 is provided with an anodization porous layer 11 formed with micropores 12, and the jet direction inside surface is provided with a plurality of openings 13 with the bottom parts communicating with the micropores. The casing 20 is provided inside with a passage that communicates with the openings 13, and a pump part 30 supplying at least gas to the passage.
