To facilitate the operation performed when an endoscope and a treatment tool are inserted into a single hole, an insertion member having a movable imaging unit disposed at a distal end thereof is integrally provided with a tubular portion that receives an operation member for remotely operating the imaging unit and a guide hole that guides the treatment tool. Since the guide portion that guides the treatment tool is formed integrally with the insertion member that movably supports the imaging unit at the distal end thereof, mere insertion of the endoscope device through a single hole enables capturing of an image of any part within a predetermined range without need for rotation of the endoscope, while preventing a change in the shape of the hole and facilitating access of the treatment tool to a target part.
