An insertion portion having an insertion body, provided on the outer circumference side of the insertion portion, the endoscope is provided with, a rotatable mounting unit about the longitudinal axis relative to the insert body. A tube body which extends along said longitudinal axis while having a gap between the member attached to the outer periphery of the insertion portion or the outer peripheral portion of the insertion portion, the mounting unit, of the tube body a fin which extends helically along the longitudinal axis to the outer peripheral portion, disposed toward the proximal direction from the tip of the mounting unit, and a tube tip which is formed of a material softer than the tube body. Between the member attached to the outer periphery of the insertion portion or the outer peripheral portion of the insertion portion and the mounting unit, the tube tip, the inner circumferential side of the tube body the gap or eliminate the gap I includes a distal end side clearance reduction unit which decreased from sites.内視鏡は、挿入本体を備える挿入部と、前記挿入部の外周方向側に設けられ、前記挿入本体に対して長手軸回りに回転可能な装着ユニットと、を備える。前記装着ユニットは、前記挿入部の外周部又は前記挿入部の前記外周部に取付けられる部材との間に隙間を有する状態で前記長手軸に沿って延設されるチューブ本体と、前記チューブ本体の外周部に長手軸に沿って螺旋状に延設されるフィン部と、前記装着ユニットの先端から基端方向に向かって設けられ、前記チューブ本体より軟らかい材料から形成されるチューブ先端部を備える。前記チューブ先端部は、前記装着ユニットと前記挿入部の前記外周部又は前記挿入部の前記外周部に取付けられる部材との間で、前記隙間をなくす又は前記隙間を前記チューブ本体の内周方向側の部位より減少させる先端側隙間減少部を備える。
