Abstract: An operation device for an into-bore introduction device, includes: a grasping section connected to a proximal portion of an insertion section to be inserted into a bore, and is to be grasped by an operator to operate the insertion section; a bending operation knob disposed on the grasping section and bends a bending portion of the insertion section; a projecting portion formed to project from the grasping section in a direction radial to a longitudinal axis of the grasping section, in a surface between a surface on which the bending operation knob is disposed and a surface on which operator's palm abuts to grasp the grasping section, in the grasping section; and an inclined surface inclined toward the insertion section on an insertion section side of the projecting portion.

Abstract: A sheath apparatus includes, a plurality of node rings configured to be tilted with respect to each other, each node ring defining a substantially cylindrical wall and having at least one hole passing through said cylindrical wall, the plurality of node rings being arranged next to each other along a linear axis such that consecutive node rings contact each other at a contact plane; a manipulating wire going through the holes in said stacked node rings; and a position restoring component configured to restore said stacked node rings from a tilted position to an original position, wherein said position restoring component is located inside or outside of the stacked node rings.