FIBER LASER DEVICE

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A fiber laser device capable of performing processing and measurement stably even when the temperature of the use environment changes is provided. The fiber laser device includes : a pumping light source 20 configured to output pumping light having a wavelength λ; and a rare earth-doped fiber, wherein when the intensity change rate of the pumping light with respect to the temperature is denoted by ΔP dB/° C., the wavelength change rate of the pumping light with respect to the temperature is denoted by Δλp nm/° C., the pumping light absorption change rate of the rare earth-doped fiber 50 per unit wavelength change at the wavelength of λ nm when the wavelength of the pumping light changes is denoted by A′ (λ) dB/nm, and the pumping light absorption change amount of the rare earth-doped fiber 50 per unit temperature change at the wavelength of λ nm when the temperature of the rare earth-doped fiber 50 changes is denoted by ΔA (λ) dB/° C., the wavelength λ of the pumping light is such a wavelength λ that ΔP, Δλp×A′ (λ) and ΔA (λ) compensate with each other.