In the present invention, an endoscope system with high observability is realized by reducing difference in brightness on each imaging face that is displayed on a monitor screen, when an endoscope with a normal viewing angle and an endoscope with a wide viewing angle are employed. In order to reduce the difference in the brightness, the endoscope system of the present invention includes a first endoscope and a second endoscope. The first endoscope includes a first illumination optical system and a first observation optical system having a first viewing angle. The second endoscope has a second illumination optical system having a second viewing angle that is wider than the first viewing angle. A second illumination region of illuminating light that is emitted from the second illumination optical system is wider than a first illumination region of the illuminating light that is emitted by the first illumination optical system, at an arbitrary distance from a distal end of an insertion portion of each of the first endoscope and the second endoscope towards a direction of observation. Here, the illuminating light of each of the first and the second endoscopes has an illuminance that is greater than or equal to a predetermined illuminance.
