To provide a laser processing system, conventionally required, which can effectively blow out materials of a work-piece melted by laser light, by making effective use of assist gas emitted from a nozzle.SOLUTION: A laser processing system 110 comprises: a nozzle 24 having an emitting port 28 that emits jet flow of assist gas along an optical axis O of laser light, which can form a maximum point of speed of the jet flow at a position away from the emitting port; a measuring instrument 76 that measures sound generated by a collision of the jet flow with an object; and a position acquiring part that acquires a position of the maximum point on the basis of output data from the measuring instrument 76.SELECTED DRAWING: Figure 12
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