An opening 30a is attached to the distal end member 20 provided with the raising base 40 of the insertion portion of the endoscope 1 so as to cover a part of the distal end member 20 and expose the space in which the raising base 40 is accommodated to the outside. In the distal end cover 30 of the endoscope having the slit portion 30k formed in the peripheral edge portion on the distal end side of the opening portion 30a, and the thin portion 30l whose distal end is connected to the slit portion 30k and extends in the proximal direction. Rotation of the distal end cover 30 relative to the distal end member 20 by abutting against a wall surface portion standing up from the region of the surface along the longitudinal axis of the insertion portion of the outer peripheral surface of the distal end member 20 And rotation stoppers 30h and 30i for preventing the rotation. 内視鏡１の挿入部の起上台４０が設けられた先端部材２０に装着されて前記先端部材２０の一部を覆い、前記起上台４０が収容される空間を外部に露呈させる開口部３０ａを有する内視鏡の先端カバー３０において、前記開口部３０ａの先端側の周縁部に形成された切れ込み部３０ｋ、および先端が前記切れ込み部３０ｋに接続されて基端方向に延在する薄肉部３０ｌを有する破断誘導部３０ｊと、前記先端部材２０の外周面のうちの挿入部長手軸に沿った面の領域中から起立した壁面部に当接することにより、前記先端部材２０に対する当該先端カバー３０の回転を抑止する回転止め部３０ｈ，３０ｉと、を具備する。
