PROBLEM TO BE SOLVED: To provide a small-sized light source device that can change the color of the light emitted from it.SOLUTION: The light source device 10 includes a first semiconductor laser 22A, a second semiconductor laser 22B and a fluorescent body unit 62. The first semiconductor laser 22A emits blue light of a wavelength of 460 nm and the second semiconductor laser 22B emits blue purple light of a wavelength of 415 nm. The fluorescent body unit 62 absorbs the blue light from the first semiconductor laser 22A, and emits light of a wavelength of about 530 nm, while it transmits almost all the blue purple light emitted from the second semiconductor laser 22B.
