PROBLEM TO BE SOLVED: To provide a laser light absorptivity measurement method and a laser light absorptivity measurement device capable of accurately measuring an absorptivity of a metal member, and provide a laser machining method based on the measured laser light absorptivity.;SOLUTION: A laser light absorptivity measurement method uses a laser device 20 and an infrared camera device 30 to measure an actual laser light absorptivity εr of a sample 62. The laser light absorptivity measurement method comprises: an actual temperature measurement step S10 for measuring an actual temperature Tr of an irradiation spot part 62a1; a theoretical raised temperature calculation step S20 for calculating a plurality of theoretical raised temperatures ΔTt based on actual irradiation conditions of the laser device 20, using a theoretical relationship defining raised temperatures of the irradiation spot part 62a1 whose temperature is to be raised, when a laser light absorptivity is regarded as a plurality of assumed laser light absorptivities; and an actual absorptivity calculation step S30 for calculating the actual laser light absorptivity εr of the sample 62 based on the actual temperature Tr and the plurality of theoretical raised temperatures ΔTt.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2018,JPO&INPIT
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