An endoscope system includes a non-visible light source configured to emit first excitation light and second excitation light onto a target, an image sensor configured to generate an image including the target excited by at least one of the first excitation light and the second excitation light to emit fluorescence, and an output device configured to output the image. The first excitation light has a half width of not more than 10 nm and a first wavelength of a non-visible light band. The second excitation light has a half width of not more than 10 nm and a second wavelength of the non-visible light band being different from the first wavelength.
