PROBLEM TO BE SOLVED: To provide a small-sized light source device capable of switching a color of its emission light.SOLUTION: A 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 having a wavelength of 460 nm and the second semiconductor laser 22B emits blue-violet light having a wavelength of 415 nm. The fluorescent body unit 62 absorbs the blue light emitted from the first semiconductor laser 22A to emit light having a wavelength of about 530 nm, but transmits almost all of the blue-violet light emitted by the second semiconductor laser 22B.
