The operation lever 45 capable of adjusting the bending angle of the bending portion 7 in conjunction with the tilting operation in the operation portion 3 and the outer peripheral edge portion are watertightly fixed to the operation portion main body 32 (operation portion 3), and the inner peripheral edge portion is operated. An operation including an outer cover 75 that covers the outer periphery of the lever 45 in a watertight manner and is deformable by pressure fluctuations inside the operation unit 3 (that is, pressure fluctuations in the sealed space 15 formed inside the endoscope 1). For the lever-type (joystick-type) endoscope 1, a regulating member 90 that regulates expansion due to fluctuations in the internal pressure of the exterior cover 75 is provided. 操作部３における傾倒動作に連動させて湾曲部７の湾曲角度を調整可能な操作レバー４５と、外周縁部が操作部本体３２（操作部３）に水密固定されるとともに、内周縁部が操作レバー４５の外周を水密に覆い、操作部３の内部の圧力変動（すなわち、内視鏡１の内部に形成された密閉空間１５の圧力変動）により変形可能な外装カバー７５と、を備えた操作レバー式（ジョイスティック式）の内視鏡１に対し、外装カバー７５の内部圧力の変動による膨張を規制する規制部材９０を設ける。
