To reduce a size of a boiler in a state where a boiler is prevented from being closed due to dust adhesion to a heat transfer pipe.SOLUTION: A waste incinerator boiler 20 is configured such that a plurality of heat transfer groups are continuously provided in a waste incinerator 10 so as to be disposed in a multistage manner in a height direction, where the heat transfer pipe group has a plurality of heat transfer pipes 6 disposed in a horizontal direction. The waste incinerator boiler is configured to generate steam with heat exchange to and from exhaust gas to enable further overheating. Adjacent stages of heat transfer pipe groups are disposed so that a horizontal position of a heat transfer pipe axis is deviated by 1/10-1/2 of a distance between axes of the heat transfer pipes 6, and comprise pressure wave generators 62, 63 configured to mix and combust fuel gas and oxidant gas under high pressure, generate pressure waves and then release the pressure waves into the boiler.SELECTED DRAWING: Figure 3
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