The light source device (1) of the present invention includes a long wavelength light source (23) that emits long wavelength light (Lr) having a peak wavelength in a red wavelength range, a green wavelength range of 500 nm to 580 nm and a peak at 580 nm or less. A single broadband light source (22) having a wavelength and emitting a broadband broadband light (Lg) having a wavelength range on the long wavelength side that overlaps the wavelength range on the short wavelength side of the long wavelength light (Lr)； The light (Lr) includes a multiplexing unit (32) that combines a wavelength range longer than the predetermined wavelength and a wavelength range of the broadband light (Lg) equal to or less than the predetermined wavelength, and the predetermined wavelength is: It is a wavelength between the peak wavelength of the long wavelength light (Lr) and the peak wavelength of the broadband light (Lg), the intensity of the long wavelength light (Lr) is 10% or more of the peak intensity, and the broadband light ( Lg) is 10% or more of the peak intensity. Is the length.本発明の光源装置（１）は、赤色の波長域にピーク波長を有する長波長光（Ｌｒ）を発する長波長光源（２３）と、５００ｎｍから５８０ｎｍの緑色の波長域を含むとともに５８０ｎｍ以下にピーク波長を有し、長波長光（Ｌｒ）の短波長側の波長域と重複する波長域を長波長側に有する広帯域の広帯域光（Ｌｇ）を発する単一の広帯域光源（２２）と、長波長光（Ｌｒ）の、所定の波長よりも長い波長域と、広帯域光（Ｌｇ）の、所定の波長以下の波長域とを合波する合波部（３２）とを備え、所定の波長は、長波長光（Ｌｒ）のピーク波長と広帯域光（Ｌｇ）のピーク波長との間の波長であるとともに、長波長光（Ｌｒ）の強度がそのピーク強度の１０％以上となり、かつ、広帯域光（Ｌｇ）の強度がそのピーク強度の１０％以上となる波長である。
