A laser processing device, comprising at least: a laser oscillator that generates laser light; an optical fiber that includes at least a core, a first cladding provided coaxially with the core on an outer peripheral side of the core, and a second cladding provided coaxially with the core on an outer peripheral side of the first cladding, and includes an incident end face and an emission end opposite to the incident end face; a beam control mechanism that is provided in the laser oscillator, introduces the laser light into the incident end face of the optical fiber, and controls a power distribution of the laser light emitted from the emission end of the optical fiber; and a laser light emitting head that is attached to the emission end of the optical fiber, and illuminates the laser light to a workpiece, characterized in that the laser oscillator includes a first laser oscillation unit that generates first laser light having a first wavelength (λ1), and a second laser oscillation unit that generates second laser light having a second wavelength (λ2) different from the first wavelength (λ1), the beam control mechanism includes at least a first condenser lens that receives the first laser light, and condenses the first laser light at a predetermined magnification, a second condenser lens that receives the second laser light, and condenses the second laser light at a predetermined magnification, an optical combining member that receives the first laser light (LB 1) condensed by the first condenser lens and the second laser light condensed by the second condenser lens, forms the laser light by combining the first laser light and the second laser light, an optical axis of the first laser light (LB 1) coinciding with an optical axis of the second laser light, and causes the laser light to be directed to the incident end face of the optical fiber, an optical path changing and holding mechanism that is disposed on at least one of an optical path of the first laser light between the first condenser lens and the optical combining member and an optical path of the second laser light between the second condenser lens and the optical combining member, and changes and holds the at least one of the optical path of the first laser light (LB 1) and the optical path of the second laser light, and a controller that controls an operation of the optical path changing and holding mechanism, and the beam control mechanism controls the power distribution of the laser light emitted from the laser light emitting head by changing an incident position of at least one of the first laser light (LB 1) and the second laser light on the incident end face of the optical fiber. a laser oscillator that generates laser light; an optical fiber that includes at least a core, a first cladding provided coaxially with the core on an outer peripheral side of the core, and a second cladding provided coaxially with the core on an outer peripheral side of the first cladding, and includes an incident end face and an emission end opposite to the incident end face; a beam control mechanism that is provided in the laser oscillator, introduces the laser light into the incident end face of the optical fiber, and controls a power distribution of the laser light emitted from the emission end of the optical fiber; and a laser light emitting head that is attached to the emission end of the optical fiber, and illuminates the laser light to a workpiece, characterized in that the laser oscillator includes a first laser oscillation unit that generates first laser light having a first wavelength (λ1), and a second laser oscillation unit that generates second laser light having a second wavelength (λ2) different from the first wavelength (λ1), the beam control mechanism includes at least a first condenser lens that receives the first laser light, and condenses the first laser light at a predetermined magnification, a second condenser lens that receives the second laser light, and condenses the second laser light at a predetermined magnification, an optical combining member that receives the first laser light (LB 1) condensed by the first condenser lens and the second laser light condensed by the second condenser lens, forms the laser light by combining the first laser light and the second laser light, an optical axis of the first laser light (LB 1) coinciding with an optical axis of the second laser light, and causes the laser light to be directed to the incident end face of the optical fiber, an optical path changing and holding mechanism that is disposed on at least one of an optical path of the first laser light between the first condenser lens and the optical combining member and an optical path of the second laser light between the second condenser lens and the optical combining member, and changes and holds the at least one of the optical path of the first laser light (LB 1) and the optical path of the second laser light, and a controller that controls an operation of the optical path changing and holding mechanism, and the beam control mechanism controls the power distribution of the laser light emitted from the laser light emitting head by changing an incident position of at least one of the first laser light (LB 1) and the second laser light on the incident end face of the optical fiber.