In the endoscope distal end structure, noise light emitted from the illumination light exit surface of the illumination optical system and directly incident on the image entrance surface of the imaging optical system is reduced. For example, the imaging optical system M including the imaging fiber 1 and the lens 2, the illumination optical system L including the light guide fiber 4, and the imaging optical system and the illumination optical system are optically isolated and the illumination light of the illumination optical system The light-shielding materials 3 and 5 in which the opening K that exposes the emission surface LS to the outside is formed, and the illumination light emission surface is disposed at a position where it is drawn into the back of the opening.内視鏡の先端構造において、照明光学系の照明光出射面から出射し直接的に撮像光学系の像入射面に入射するノイズ光を低減する。例えばイメージングファイバー１とレンズ２とからなる撮像光学系Ｍと、例えばライトガイドファイバー４からなる照明光学系Ｌと、撮像光学系と照明光学系とを光学的に隔絶するとともに照明光学系の照明光出射面ＬＳを外部に露出させる開口Ｋが形成された遮光性材料３，５とを備え、照明光出射面が開口の奥に引き込んだ位置に配置される。
