To provide an endoscope with a lighting unit that may be substantially uniformly illuminated the entire observation region of the lateral field and a forward field of view without interfering with the wide field of view , the present invention , forming the object to be observed of the insertion portion 2 forward illumination light with the objective lens 21 of the first to the image , an objective lens 22 of the second circumferential for imaging the object to be observed on the side of the insertion portion , disposed adjacent the outer periphery of the second object lens a first light guide 31a for guiding the insertion tip , and a second light guide 32a for guiding the insertion tip illumination light provided to the proximal end of the second objective lens , the objective lens of the first a front illumination lens 31 of the light guide portion 31c to be incident on the circular optical part illumination light and an annular optical portion 31b of the annular having an optical directional is arranged so as to surround the outer peripheral side , and insert the illumination light and a side illumination lens 32 including a prism to exit the insertion portion front part as well emit in the section side , the light guiding portion of the two and a light reflecting surface 31e of the two light entrance plane 31d the reflecting surface is incident to the circular optical portion. [ Selection ] Figure Figure 1本発明は、広視野を妨げず前方視野と側方視野の全観察領域を略均一に照明し得る照明ユニットを備えた内視鏡を提供するために、挿入部2前方の観察対象物を結像させる第1の対物レンズ21と、挿入部の側方の観察対象物を結像させる円周状の第2の対物レンズ22と、第2の対物レンズの外周に隣接して設けられ照明光を挿入部先端に導光する第1ライトガイド31aと、第2の対物レンズの基端側に設けられ照明光を挿入部先端に導光する第2ライトガイド32aと、第1の対物レンズの外周側を囲むように配置され光学的指向性を有し円環状の環状光学部31bと照明光を環状光学部に入射させる導光部31cとからなる前方照明用レンズ31と、照明光を挿入部側方に出射させると共に一部を挿入部前方に出射させるプリズムを含む側方照明用レンズ32とを備え、導光部は光入射面31dと2つの光反射面31eとを有し2つの反射面は環状光学部内へ入射させる。【選択図】図1
