To provide an endoscope having a closing mechanism of the communication passage to eliminate the internal and external pressure difference of the endoscope, the present invention includes a partition wall 9 which shields the inner space and outer space, a watertight capable to bulkhead a tubular member 21 having a through hole 21f that penetrates from the inside wall surface on the outer circumference having an internal wall surface forming a communicating hole 21g communicating with the linked space inside, is fixed to hold the watertight to the communication hole and the inner space a valve body 25 having a check valve 23 for opening and closing depending on the pressure difference between the outer space, the first frame that is configured to operably axially and circumferentially of the provided on the outer peripheral side of the cylindrical body cylindrical body and body 26, between the first space and the outer space by the operation of the first frame member to form a first space AR communicating with the exterior by the through-hole to hold the watertight the tubular member and the first frame member and the second frame 27 for switching the opening and closing, the cam pin 29 provided on the outer peripheral surface of the cylindrical body, and is cam pin slidably disposed provided on the first frame body origin unit guided to the cam pin and a cam groove 26d having an intermediate portion and end portion.内視鏡の内外気圧差を解消する連通路の開閉機構を備えた内視鏡を提供するために、本発明は、内側空間と外側空間とを遮蔽する隔壁9と、隔壁に対し水密可能に連結され内側空間に連通する連通孔21gを形成する内部壁面を有し内部壁面から外周に貫通する貫通孔21fを有する筒状体21と、連通孔に水密性を保持して固定され内側空間と外側空間との圧力差に応じ開閉する逆止弁部23を有する弁体25と、筒状体の外周側に設けられ筒状体の軸方向及び周方向に作動可能に構成された第1枠体26と、筒状体及び第1枠体に水密性を保持して外装され貫通孔に連通する第1空間ARを形成し第1枠体の作動によって第1空間と外側空間との間の開閉を切り換える第2の枠体27と、筒状体の外周面に設けられたカムピン29と、第1枠体に設けられカムピンと摺動可能に配設されてカムピンにガイドされる起点部と中間部と終点部とを有するカム溝26dとを具備する。
