The purpose of the present invention is, while ensuring sufficient light distribution and brightness, to alleviate flare or halation and carry out desirable observation. Provided is an endoscope device, comprising: an observation optical system which is disposed on the leading end of an insertion part of the endoscope device for observing a subject for observation and a plurality of illumination optical systems which is disposed in the insertion part, distributes illumination light which is emitted from a light source upon the subject for observation, and illuminates a common field of view. Among the plurality of illumination optical systems, the illumination optical system with the widest light distribution is further from the observation optical system than the illumination optical system with the narrowest light distribution, and the following formula is satisfied:0.6 ≤ øsfw / øwfs ≤ 1.0 ... (1)Wherein: fw is the focal length of the illumination optical system with the widest light distribution fs is the focal length of the illumination optical system with the narrowest light distribution øw is the outer diameter of the lens which is positioned in the face closest to the object side of the illumination optical system with the widest light distribution and øs is the outer diameter of the lens which is positioned in the face closest to the object side of the illumination optical system with the narrowest light distribution.La présente invention a pour but datténuer, tout en garantissant une luminosité et une distribution de lumière suffisantes, une irradiation ou un halo et deffectuer une observation souhaitable. Linvention concerne un dispositif dendoscope qui comporte : un système optique dobservation, qui est disposé sur lextrémité avant dune partie dinsertion du dispositif dendoscope pour observer un sujet dobservation une pluralité de systèmes optiques déclairage, qui sont disposés dans la partie dinsertion, qui distribuent la lumière déclairage émise par une
