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 grasped by an operator to operate the insertion section a bending operation knob disposed on the grasping section and bending a bending portion of the insertion section a projecting portion formed to project from the grasping section in a radial direction 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 operators palm abuts to grasp the grasping section, in the grasping section a pressing switch disposed on the projecting portion and that operates the insertion section and an inclined surface formed distantly by as much as a predetermined distance from the pressing switch, and in which an amount of the inclined surface to project outside in the radial direction is decreased on an insertion section side of the projecting portion.
