PROBLEM TO BE SOLVED: To provide an endoscope having a non-circular illumination window which enables desired light distribution characteristics to be achieved and whose illumination optical system can be manufactured easily.SOLUTION: An endoscope includes: an insertion part an observation window provided at the tip of the insertion part an illumination window provided at the tip of the insertion part which has a slender shape along a predetermined axial direction and a light distribution control member 17 which is arranged behind the illumination window, and which has an incidence plane 17a on which illumination light is incident and an emission plane 17b which emits the illumination light to the illumination window, and has a prism surface on which a plurality of prisms with a plurality of inclined planes provided on a plane part and around the plane part are regularly formed, on the incidence plane 17a.COPYRIGHT: (C)2016,JPO&INPIT【課題】非円形の照明窓を有する内視鏡において、所望の配光特性が得られ、かつ照明光学系の製造が容易な内視鏡を提供する。【解決手段】内視鏡は、挿入部と、挿入部の先端部に設けられた観察窓と、挿入部の先端部に設けられ、所定の軸方向に沿った細長形状を有する照明窓と、照明窓の後ろ側に配設され、照明光を入射する入射面17aと、照明光を照明窓へ出射する出射面17bを有し、平面部とその平面部の周囲に設けられた複数の傾斜面を有するプリズムが複数、規則的に形成されたプリズム面を、入射面17aに有する配光制御部材17と、を有する。【選択図】図4
