Improving the light distribution characteristic of illumination light, while guaranteeing satisfactory observation range of vision, miniaturizing the point of the insertion section, insertion characteristic the endoscope which can improve is offered. The point (11) the insertion section of the tube condition which it possesses (13) with, the insertion section (13) to be accommodated inside and the light/write guide who illumination light derived light is done (15) with, the insertion section (13) the point (11) be arranged the point (11) toward facing, the observation territory which illuminates the light/write guide (15) with the flat concave lens which irradiates the illumination light which derived light is done (17) and the flat concave lens (17) by the object glass which condenses (19) with to have light from (A), the light/write guide (15) the flat concave lensThe flat concave lens where (17) the end which opposes, the object glass (19) the optical axis (L) with extends in abbreviation and, balance in order the point (11) the cartridge shoulder (21) and the cartridge shoulder (21) is located (17) the outside, to become tapering facing toward the point, the endoscope which is inclined (1) is adopted.照明光の配光性を向上させて良好な観察視野を確保しつつ、挿入部の先端部を小型化して挿入性を向上することができる内視鏡を提供する。先端部(11)を有するチューブ状の挿入部(13)と、挿入部(13)内に収容され先端部(11)に向かって照明光を導光するライトガイド(15)と、挿入部(13)の先端部(11)に配置され、ライトガイド(15)により導光された照明光を照射する平凹レンズ(17)および平凹レンズ(17)により照明された観察領域(A)からの光を集光する対物レンズ(19)とを備え、ライトガイド(15)の平凹レンズ(17)に対向する端部が、対物レンズ(19)の光軸(L)と略平行に延び、先端部(11)の肩部(21)および肩部(21)に位置する平凹レンズ(17)の外面が、先端に向かって先細になるように傾斜している内視鏡(1)を採用する。
