LASER LIGHT SOURCE DEVICE

Provided is a laser light source device stably operating, stably emitting laser light having a predetermined wavelength, and ensuring lower power consumption than that of the related art. The laser light source device includes a semiconductor laser element configured to emit laser light, a heat radiation part provided on one surface side of the semiconductor laser element, a heat conductive part having heat conductive characteristics, provided in contact with the one surface of the semiconductor laser element and the heat radiation part, configured to conduct heat generated in the semiconductor laser element to the heat radiation part, a wavelength measuring part configured to measure a wavelength of the laser light, and a heat conductive characteristic control part configured to change the heat conductive characteristics of the heat conductive part based on the wavelength of the laser light measured by the wavelength measuring device, and control the wavelength of the laser light to fall within a predetermined wavelength range.