Abstract: Provided is an endoscope with a narrower diameter at a distal end portion of an insertion part to be inserted into a body of a subject.

Abstract: An endoscope of the invention has a first surface constituting a distal end surface of the insertion part, a second surface formed on a projecting part projecting from the first surface to a front side, and an observation window provided on the second surface. The first surface has a fluid jetting nozzle, a first protective projection, and a second protective projection. The projecting part has an extending part extending from the observation window toward a side opposite to the fluid jetting nozzle. In all combinations of imaginary planes capable of coming into contact with, from the front side, at least two of the fluid jetting nozzle, the first protective projection, the second protective projection, and the extending part, the imaginary planes are disposed forward of the observation window.

Abstract: Cleaning performance or wiping performance for an observation window is improved in an endoscope. In a distal end face of a distal end part of the endoscope, a guide part rising to a distal end side is provided between an observation window and a fluid injection nozzle. A width of the guide face of the guide part has a narrowed part, and a portion with the narrowest width serves as a fluid guiding part. The fluid guiding part guides fluid passing through a position of the fluid guiding part, in fluid injected from the fluid injection nozzle, to a first fluid route through which the fluid is guided to the observation window. Fluid deviated from the fluid guiding part is guided to a region adjacent to the observation window through a second fluid route.

Abstract: An endoscope of the invention has a first surface constituting a distal end surface of the insertion part, a second surface formed on a projecting part projecting from the first surface to a front side, and an observation window provided on the second surface. The first surface has a fluid jetting nozzle, a first protective projection, and a second protective projection. The projecting part has an extending part extending from the observation window toward a side opposite to the fluid jetting nozzle. In all combinations of imaginary planes capable of coming into contact with, from the front side, at least two of the fluid jetting nozzle, the first protective projection, the second protective projection, and the extending part, the imaginary planes are disposed forward of the observation window.

Abstract: Cleaning performance or wiping performance for an observation window is improved in an endoscope. In a distal end face of a distal end part of the endoscope, a guide part rising to a distal end side is provided between an observation window and a fluid injection nozzle. A width of the guide face of the guide part has a narrowed part, and a portion with the narrowest width serves as a fluid guiding part. The fluid guiding part guides fluid passing through a position of the fluid guiding part, in fluid injected from the fluid injection nozzle, to a first fluid route through which the fluid is guided to the observation window. Fluid deviated from the fluid guiding part is guided to a region adjacent to the observation window through a second fluid route.