An endoscope system includes a first endoscope (11) and a second endoscope (12). The first endoscope (11) has an insertion portion with a small diameter that is capable of performing a predetermined bending manipulation inside an inside diameter of an observation portion. The second endoscope (12) has an insertion portion with a large diameter in which a range of bending motion is restricted with respect to a range of bending motion of the first endoscope (11) by the inside diameter of the observation area. A viewing angle of an observation optical system of the second endoscope (12) is set to be wider than a viewing angle of an observation optical system of the first endoscope (11). Consequently, by configuring the endoscope as described above, the observation region, as similar to those of the first endoscope (11) can be realized for the second endoscope (12) having the insertion portion with a large diameter.
