The endoscope is arranged in a direct-view observation window provided with a direct-view objective lens at the distal end of the insertion portion and a direct-view illumination window formed on the outer peripheral side of the direct-view observation window, and the outer periphery that is the lower side of the direct-view observation field of view It has a C-ring shape that guides the light incident on the incident surface formed by cutting out the part, a reflective surface that scatters and reflects light on the back surface, and transmits light to the front surface to illuminate the direct-view observation field A light guide plate having a transmission surface for emitting light, and a light emitting unit for emitting light so as to be incident on the incident surface of the light guide plate. It has a wedge-shaped reflection surface formed by cutting out a wedge shape from the back to the front.内視鏡は、挿入部の先端部に、直視用対物レンズが設けられた直視観察窓と、直視観察窓の外周側に形成した直視照明窓に配置され、直視観察視野の下部側となる外周部分を切り欠いて形成した入射面に入射された光を導光するＣリング形状を有し、背面に光を散乱して反射する反射面、前面に光を透過して直視観察視野側に照明光として出射する透過面をそれぞれ形成した導光板と、導光板における前記入射面に入射するように光を出射する光出射部と、を有し、導光板における上部側の位置に、導光板の背面から前面側に向かって楔形状に切り欠いて形成した楔形状の反射面を有する。
