A light source device comprising: at least one semiconductor laser for excitation; a laser-excited light source having a phosphor configured to be excited by the at least one semiconductor laser, and a first optical system for extracting fluorescence emitted from the phosphor; a plurality of LED light sources (120A-120D) for emitting light having wavelengths different from a wavelength of the fluorescence; and a second optical system for synthesizing the fluorescence from the laser-excited light source with the light from the plurality of LED light sources, and emitting the synthesized light from a light emitting portion, the plurality of LED light sources (120A-120D) including an LED light source configured to emit light in an ultraviolet range, wherein the LED light source configured to emit light in the ultraviolet range experiences a greater decrease in intensity output with increasing temperature than the remaining LED light source or LED light sources configured to emit light of other wavelengths, and of the plurality of LED light sources, the LED light source configured to emit the light in the ultraviolet range being disposed at a position farther from the laser-excited light source than the remaining LED light source or LED light sources configured to emit light of other wavelengths, such that during operation of the light source device a temperature rise of the LED light source configured to emit light in the ultraviolet range, due to heat emitted by the laser-excited light source, is suppressed, and consequently a decrease in intensity output from the LED light source configured to emit light in the ultraviolet range, due to heat emitted by the laser-excited light source, is suppressed. at least one semiconductor laser for excitation; a laser-excited light source having a phosphor configured to be excited by the at least one semiconductor laser, and a first optical system for extracting fluorescence emitted from the phosphor; a plurality of LED light sources (120A-120D) for emitting light having wavelengths different from a wavelength of the fluorescence; and a second optical system for synthesizing the fluorescence from the laser-excited light source with the light from the plurality of LED light sources, and emitting the synthesized light from a light emitting portion, the plurality of LED light sources (120A-120D) including an LED light source configured to emit light in an ultraviolet range, wherein the LED light source configured to emit light in the ultraviolet range experiences a greater decrease in intensity output with increasing temperature than the remaining LED light source or LED light sources configured to emit light of other wavelengths, and of the plurality of LED light sources, the LED light source configured to emit the light in the ultraviolet range being disposed at a position farther from the laser-excited light source than the remaining LED light source or LED light sources configured to emit light of other wavelengths, such that during operation of the light source device a temperature rise of the LED light source configured to emit light in the ultraviolet range, due to heat emitted by the laser-excited light source, is suppressed, and consequently a decrease in intensity output from the LED light source configured to emit light in the ultraviolet range, due to heat emitted by the laser-excited light source, is suppressed.