A light-source device (1) of the present invention includes: a long-wavelength light source (23) that emits a long-wavelength light beam (Lr) that has a peak wavelength in a red wavelength region； a single broadband light source (22) that emits a broadband light beam (Lg) that includes a green wavelength region from 500 nm to 580 nm, that has a peak wavelength in a region that is equal to or less than 580 nm, and that has, on a long-wavelength side, a wavelength region that overlaps with a wavelength region of the long-wavelength light beam (Lr) on a short-wavelength side； and a multiplexing portion (32) that multiplexes a wavelength region of the long-wavelength light beam (Lr) that is greater than a predetermined wavelength and a wavelength region of the broadband light beam (Lg) that is equal to or less than the predetermined wavelength, wherein the predetermined wavelength is a wavelength between the peak wavelength of the long-wavelength light beam (Lr) and the peak wavelength of the broadband light beam (Lg), and is a wavelength at which an intensity of the long-wavelength light beam (Lr) is equal to or greater than 10 % of the peak intensity thereof, and at which an intensity of the broadband light beam (Lg) is equal to or greater than 10 % of the peak intensity thereof.
