Provided are a sheathing tube and a surgery device for an endoscope, whereby it is possible to selectively switch, by a simple operation, between a state in which a tubular member (mantle tube or the like) can rotate about the axial direction and a state in which the tubular member cannot rotate. An outer port (500) to which the present invention is applied is a sheathing tube for preventing rotation or advancing/retreating movement relative to a body wall, the sheathing tube being installed over a mantle tube (300) inserted through the body wall, and is provided with: an insertion part (540) (inner cylinder (552)) having a distal-end opening out of which the mantle tube (300) is guided； a head part (560) having a proximal-end opening into which an outer port (560) is introduced, the head part (560) being rotatably connected to a proximal-end part of the inner cylinder (552)； a pressure-welded member (576) for restricting rotation of the mantle tube (300), the pressure-welded member (576) being provided to the outer port (560)； a spring member (578) disposed between the inner cylinder (552) and the head part (560) and capable of deforming to a rotation-locked state in which rotation of the head part (560) relative to the inner cylinder (552) is restricted by engagement of the spring member (578) with the proximal-end part of the inner cylinder (552), and a rotation-unlocked state in which the engagement is released and the head part (560) can rotate relative to the inner cylinder (552)； and a rotary operating member (590) for deforming the spring member (578) between the rotation-locked state and the rotation-unlocked state, the rotary operating member (590) being rotatably provided to the head part (560).La présente invention concerne un tube de gainage et un dispositif chirurgical pour un endoscope, qui permettent de commuter sélectivement, par un actionnement simple, entre un état dans lequel un élément tubulaire (tube d'enveloppe ou similaire) peut tourner autou
