The insertion portion of the endoscope includes a cylindrical distal end base and a rigid member 212 fitted in the distal end base and having a small diameter portion 217 fixed to the distal end base with an adhesive applied to the outer surface . The small diameter portion 217 is provided with a storage portion 2174 extending inwardly from the front end of the small diameter portion 217, a cutout portion 2175 cut out from the tip of the small diameter portion 217 to communicate the inside and the outside of the storage portion 2174, A blocking portion 2171 extending in the axial direction of the inserting portion and blocking the adhesive flowing toward the cutout portion 2175 along the outer surface of the small diameter portion 217, a blocking portion 2171 connected to the blocking portion 2171, And a reservoir portion 2172 for storing a part of the adhesive blocked by the adhesive agent.内視鏡の挿入部は、筒状の先端ベースと、先端ベースの内部に嵌合するとともに外面に塗布された接着剤により先端ベースに対して固定される小径部217を有する硬性部材212とを備える。小径部217には、小径部217の先端から内部に向けて延びる収納部2174と、小径部217の先端から切り欠かれ、収納部2174の内外を連通する切欠部2175と、小径部217の外面に沿って挿入部の軸方向に延び、小径部217の外面に沿って切欠部2175に向けて流れる接着剤を堰き止める堰止部2171と、堰止部2171に連設され、堰止部2171にて堰き止められた接着剤の一部を貯留する貯留部2172とが設けられている。
