Operation device for into-bore introduction device, and into-bore introduction device

An operation device for an into-bore introduction device, comprising:

• a grasping section that is 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 that is disposed on the grasping section and that bends a bending portion of the insertion section;
• a projecting portion that projects from the grasping section radially in relation to a longitudinal axis of the grasping section, the projecting portion being formed on a third surface between a second surface on which the bending operation knob is disposed and a fourth surface, which is on an opposite side of the grasping section from the second surface, the projecting portion including a projecting surface, which is a surface of the projecting portion that is closest to the insertion section;
• a pressing switch that is disposed on the projecting portion and that operates the insertion section;
• and
• a corner portion that is disposed at an intersection between the projecting portion and the fourth surface,
• an inclined surface that is formed at a position of the projecting surface of the projecting portion adjacent to the second surface and a position of an equal distance from the pressing switch toward a side close to the insertion section along the longitudinal axis, to the shortest distance defined between an edge portion in the direction peripheral to the longitudinal axis and the pressing switch on a surface between the second surface and the fourth surface, the inclined surface being a circular surface that is between the second surface and the projecting surface and convex in a direction away from the pressing switch.