A three-dimensional shaped article production method for producing a three-dimensional shaped article by stacking layers formed in a predetermined pattern, comprising repeatedly performing a series of steps including a composition supply step of supplying a composition containing a plurality of particles to a predetermined part, and a bonding step of bonding the particles by irradiation with a laser light, wherein the composition supply step includes a step of forming a first region using a first composition containing first particles as the composition, and a step of forming a second region using a second composition containing second particles as the composition, the bonding of the particles in the first region is performed by irradiation with a first laser light, the bonding of the particles in the second region is performed by irradiation with a second laser light, characterized in that the first laser light has a maximum peak wavelength within a range of 0.5 μm or more and 2.0 μm or less, and the second laser light has a maximum peak wavelength within a range of 7.0 μm or more and 15 μm or less, when a peak wavelength of the first laser light is represented by λ1 [μm], a difference between an absorption ratio of light with a wavelength of λ1 of the constituent material of the first particles and an absorption ratio of light with a wavelength of λ1 of the constituent material of the second particles is 10% or more of the absorption ratio of light with a wavelength λ1 of the constituent material of the first particles, when a peak wavelength of the second laser light is represented by λ2 [μm], a difference between an absorption ratio of light with a wavelength of λ2 of the constituent material of the second particles and an absorption ratio of light with a wavelength of λ2 of the constituent material of the first particles is 10% or more of the absorption ratio of light with a wavelength λ2 of the constituent material of the second particles, the first particles contain at least one member selected from the group consisting of magnesium, iron, copper, cobalt, titanium, chromium, aluminum, a maraging steel, stainless steel, cobalt-chrome-molybdenum, a titanium alloy, a nickel alloy, an aluminum alloy, a cobalt alloy, a magnesium alloy, and a cobalt-chromium alloy, and the second particles contain at least one member selected from the group consisting of alumina, silica, zirconia, and silicon nitride. a composition supply step of supplying a composition containing a plurality of particles to a predetermined part, and a bonding step of bonding the particles by irradiation with a laser light, wherein the composition supply step includes a step of forming a first region using a first composition containing first particles as the composition, and a step of forming a second region using a second composition containing second particles as the composition, the bonding of the particles in the first region is performed by irradiation with a first laser light, the bonding of the particles in the second region is performed by irradiation with a second laser light, characterized in that the first laser light has a maximum peak wavelength within a range of 0.5 μm or more and 2.0 μm or less, and the second laser light has a maximum peak wavelength within a range of 7.0 μm or more and 15 μm or less, when a peak wavelength of the first laser light is represented by λ1 [μm], a difference between an absorption ratio of light with a wavelength of λ1 of the constituent material of the first particles and an absorption ratio of light with a wavelength of λ1 of the constituent material of the second particles is 10% or more of the absorption ratio of light with a wavelength λ1 of the constituent material of the first particles, when a peak wavelength of the second laser light is represented by λ2 [μm], a difference between an absorption ratio of light with a wavelength of λ2 of the constituent material of the second particles and an absorption ratio of light with a wavelength of λ2 of the constituent material of the first particles is 10% or more of the absorption ratio of light with a wavelength λ2 of the constituent material of the second particles, the first particles contain at least one member selected from the group consisting of magnesium, iron, copper, cobalt, titanium, chromium, aluminum, a maraging steel, stainless steel, cobalt-chrome-molybdenum, a titanium alloy, a nickel alloy, an aluminum alloy, a cobalt alloy, a magnesium alloy, and a cobalt-chromium alloy, and the second particles contain at least one member selected from the group consisting of alumina, silica, zirconia, and silicon nitride.