An endoscope system of the present invention is provided with: a long, thin inserted portion that includes an illuminating portion that emits an illumination light beam toward an imaging subject, an image-acquisition portion that acquires an image of the imaging subject, and a channel and an illumination device that is disposed in the channel, wherein the illumination device includes an illuminating portion that emits, toward the imaging subject, an illumination light beam that has a divergence angle that is smaller than that of the illumination light beam and for which the image-acquisition portion has sensitivity, and a pulling member that extends to outside the channel from a base end of the illuminating portion, and wherein the illuminating portion can be removed from the channel by pulling the pulling member.
