| abstract |
(57) Abstract: In an endoscope apparatus, a laser light source can be used as a light source of illumination light or excitation light, and unevenness of a diagnostic image due to laser light interference is reduced. SOLUTION: A white light source 1 in a lighting unit 110 is provided. 11 includes a red semiconductor laser 111a, a green semiconductor laser 111b, and a blue semiconductor laser 111c, each of which emits multi-longitudinal mode light having a spectral distribution of a plurality of wavelengths λ with little interference; The GaN-based semiconductor laser 114 also emits multi-longitudinal mode excitation light with little interference. |