PROBLEM TO BE SOLVED: To provide a method, generating nozzle and generator for generating micro/nanobubble for the purpose of performing clean washing and sterilization by generating a large amount of micro/nanobubbles with only pure water excluding material such as nucleating agent as well as constructing a system for generating micro/nanobubbles without contamination.SOLUTION: A generating method jets solution including dissolved gas from each of two or more outgoing ports and uses a water hammering force developed by mutual collision. A generating nozzle includes: a hollow tube two or more small through-holes in the peripheral direction of the tube and discharging ports for micro/nanobubbles at both ends of the tube. The small through-holes are structured so that all extensions passing through the cross-sectional center portions of the small through-holes intersect inside the tube. A generator includes not only the generating nozzle but also components capable of generating micro/nanobubbles in large quantity.
