To provide an endoscope in which a configuration of an opening port of a fluid provided in an operation section of an endoscope for inspecting living tissue is simple, and a signal line extending from the distal end portion and a flow path are arranged, Provide a configuration without bulge in space.SOLUTION: An opening port of a fluid operation portion for sending out and sucking fluid of an endoscope for inspecting living tissue is provided with a projecting portion of a tubular outer shell member having a projecting portion internal space, A cap member inserted into an apparatus for supplying or sucking the fluid, which is inserted so as not to move in the insertion direction and a cap member provided on the outer periphery of the mouthpiece member for supplying or sucking the fluid, And a fixing member configured to be fixed to the protrusion by pressing the base member positioned in the gap between the base member and the base member in the insertion direction of the base member. The distal end on the insertion side of the mouthpiece member fixed to the projecting portion by the fixing member is located in the interior space of the projecting portion.(FIG.【課題】生体組織を検査する内視鏡の操作部に設けられる流体の開口ポートの構成が簡素であり、先端部から延びる信号線及び流路が配置される、操作部内の開口ポート周りの内部空間において出っ張りがない構成を提供する。【解決手段】生体組織を検査する内視鏡の流体を送出、吸引する流体操作部の開口ポートは、突出部内部空間を有する管形状の外殻部材の突出部と、前記突出部内部空間に挿入され、前記挿入方向に移動しないように位置決めされた、前記流体の供給あるいは吸引を行う装置に装着される口金部材と、前記口金部材の外周に設けられ、前記口金部材と前記突出部との間の隙間に挿入され、位置決めされた前記口金部材を前記口金部材の挿入方向に押圧して前記突出部に固定するように構成された固定部材と、を備える。前記固定部材により前記突出部に固定された前記口金部材の挿入側先端は、前記突出部内部空間に位置する。【選択図】図3
