This light source device is provided with one light emitting unit (300) from which light is emitted, a plurality of light source units (100), an optical coupler (200), and a control unit (420). The plurality of light source units (100) emits light having a different wavelength from one another. The optical coupler (200) connects the light emitting unit (300) with the plurality of light source units (100). The control unit (420) controls the plurality of light source units (100) via a driver (410). Moreover, the plurality of light source units (100) is each provided with a light-emitting element (110) and a wavelength converting unit (140). The wavelength converting unit (140) converts the wavelength of light emitted from the light-emitting element thereby producing light to be emitted.
