A light source device according to an embodiment of the present disclosure includes: a light source section including a first light source outputting light in a first wavelength range and a second light source outputting light in a second wavelength range in a same direction as the light in the first wavelength range; a wavelength converter that is excited by the light in the first wavelength range to output fluorescent light; a light condenser that concentrates the light in the first wavelength range and the light in the second wavelength range on the wavelength converter; and a multiplexer that transmits light in the first wavelength range and that reflects at least a portion of the light in the second wavelength range in accordance with incident angles of the light, and combines the light in the first wavelength range, the light in the second wavelength range, and the fluorescent light.