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 operators 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.
