A fiber laser device includes: a laser oscillator to emit laser light having a first wavelength; a first optical filter to transmit the laser light having the first wavelength; a wavelength converter to generate laser light having a second wavelength using stimulated Raman scattering caused by the laser light having the first wavelength and transmit the laser light having the first wavelength and the laser light having the second wavelength; and a second optical filter to transmit the laser light having the second wavelength and prevent transmission of laser light having the first wavelength. The laser light having the second wavelength that has passed through the second optical filter travels through an optical fiber amplifier and an output end. The first optical filter, the wavelength converter and the second optical filter are each constituted by a photonic band gap fiber.