Attachment for endoscope and endoscope system

An endoscope system comprising:

• an endoscope having a leading end surface on which an observation window for observing an inside of a subject's body and a first opening for jetting a constant-pressure supplied gas are formed;
• and
• an attachment for the endoscope being attached to a leading end part of the endoscope,
• the attachment comprising:
• a second opening provided at a position separate from the leading end surface;
• a pipe conduit that communicates the first opening and the second opening with each other so as to jet the constant-pressure supplied gas only from the second opening;
• and
• a region separating member that separates a jetting region of the constant-pressure supplied gas jetted from the second opening from a region of view of the observation window,
• wherein the region separating member comprises a cylindrically shaped hood fitted onto an outer circumferential surface of the leading end part, an entirety of the hood being provided in a region outside of view that is outside of a region of view of the observation window,
• wherein the second opening is formed on a side surface of the hood on a side close to the first opening,
• wherein the pipe conduit comprises a pipe-like member that is bent in an L-shape includes:
• a horizontal part perpendicular to an axial direction of the endoscope;
• and
• a vertical part parallel to the axial direction of the endoscope, with the pipe-like member being attached to the leading end part of the endoscope, and
• wherein the pipe conduit is provided to the hood so that an opening of the horizontal part is coupled to the second opening and an opening of the vertical part can be coupled to the first opening.