The present invention provides an endoscope (10) that makes it possible to obtain a satisfactory observation field. The endoscope (10) is provided with: an illumination optical system comprising an illumination window (52) that protrudes from the end surface (561) of an insertion section； a cylindrical body (57) protruding from the end surface (561)； and an observation window (51) that is arranged on the inside of the cylindrical body (57) and that protrudes from the end surface (561). The illumination window (52) and the observation window (51) satisfy formula (1) and formula (2), and the intersection of the optical axis of the illumination optical system and a straight line connecting the edge of a light entry surface of the observation window (51) and the edge of an end surface of the cylindrical body (57) is positioned further toward the insertion section side than the end surface (561) of the insertion section. Formula (1): C ≥ D. Formula (2): E ≥ D. C is the maximum amount by which the observation window protrudes from the end surface of the insertion section. D is the maximum amount by which the illumination window protrudes from the end surface of the insertion section. E is the amount by which the edge of the light entry surface of the observation window protrudes from the end surface of the insertion section.La présente invention concerne un endoscope (10) qui permet d'obtenir un champ d'observation satisfaisant. L'endoscope (10) comprend : un système optique d'éclairage comprenant une fenêtre d'éclairage (52) qui fait saillie à partir de la surface d'extrémité (561) d'une section d'insertion； un corps cylindrique (57) faisant saillie à partir de la surface d'extrémité (561)； et une fenêtre d'observation (51) qui est disposée sur l'intérieur du corps cylindrique (57) et qui fait saillie à partir de la surface d'extrémité (561). La fenêtre d'éclairage (52) et la fenêtre d'observation (51) satisfont la formule (1) et à la formule (2), et l'intersection de l'
