To provide a detonation generating device having a throat part easy to be replaced.

A detonation generator 7A of the detonation generating device 1 includes a combustion cylinder 9A having a cylindrical composition of a coaxial multiple structure, a combustion cylinder base 8 having a fuel injection nozzle 12 for injecting fuel into a premixing chamber 11a formed on the combustion cylinder base 8 side of the combustion cylinder 9 and air injection holes 17a, 17b for supplying air to the injected fuel and stirring the fuel, air ejecting nozzles 25A, 25B which project in the premixing chamber 11a, eject air which is heat-exchanged and heated in the combustion cylinder 9A from a cooling air flow passage 24A, and induce a swirl flow of air-fuel mixture in the premixing chamber 11a, a combustion cylinder opening end part 10A provided on a combustion cylinder edge 9f side to form the throat part 29, and an igniter 21. The combustion cylinder opening end part 10A includes cooling air circulation passages 23B, 24B communicating with cooling air flow passages 23A, 24A of the combustion cylinder 9A, and is removable from the combustion cylinder edge 9f by flanges 9d, 10e.

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