Endoscope

1. An endoscope comprising:

an insertion part that includes a distal end and a proximal end;

a distal-end-portion body that is provided on a distal end side of the insertion part and formed with a treatment tool outlet from which a treatment tool is led out; and

an ultrasound transducer that is provided on a distal end side of the distal-end-portion body,

wherein the distal-end-portion body includes a pair of walls that includes wall surfaces facing each other, a standing base that is disposed in a space formed by the pair of walls and connected to the treatment tool outlet and that is rotationally moved between a standing position and a falling position, an observation window that is disposed on a flat surface inclined with respect to an axial direction of the distal-end-portion body on the distal end side of one wall of the pair of walls, a nozzle that is provided on the flat surface on one side of the observation window opposite to the space and ejects washing water to the observation window, and a fluid pipe line that is connected to the nozzle, and

wherein the wall surface of the other wall of the pair of walls is positioned on an extension of an ejection direction of the washing water to be ejected from the nozzle.

2. The endoscope according to claim 1 ,

wherein the ejection direction of the washing water to be ejected from the nozzle is a direction crossing the axial direction of the distal-end-portion body.

3. The endoscope according to claim 1 ,

wherein the nozzle is disposed on the distal end side of the distal-end-portion body, and

wherein the observation window is disposed closer to a proximal end of the distal-end-portion body than the nozzle.

4. The endoscope according to claim 2 ,

wherein the nozzle is disposed on the distal end side of the distal-end-portion body, and

wherein the observation window is disposed closer to a proximal end of the distal-end-portion body than the nozzle.

5. The endoscope according to claim 1 ,

wherein the nozzle is disposed closer to an outer periphery of the distal-end-portion body than the observation window.

6. The endoscope according to claim 2 ,

wherein the nozzle is disposed closer to an outer periphery of the distal-end-portion body than the observation window.

7. The endoscope according to claim 3 ,

wherein the nozzle is disposed closer to an outer periphery of the distal-end-portion body than the observation window.

8. The endoscope according to claim 4 ,

wherein the nozzle is disposed closer to an outer periphery of the distal-end-portion body than the observation window.

9. The endoscope according to claim 1 ,

wherein the wall surface of the other wall of the pair of walls is longer than the wall surface of the one wall in the axial direction of the distal-end-portion body, and

wherein a distal end of the wall surface of the other wall is disposed closer to the distal end side of the distal-end-portion body than a distal end of the wall surface of one wall.

10. The endoscope according to claim 2 ,

wherein the wall surface of the other wall of the pair of walls is longer than the wall surface of the one wall in the axial direction of the distal-end-portion body, and

wherein a distal end of the wall surface of the other wall is disposed closer to the distal end side of the distal-end-portion body than a distal end of the wall surface of one wall.

11. The endoscope according to claim 3 ,

wherein the wall surface of the other wall of the pair of walls is longer than the wall surface of the one wall in the axial direction of the distal-end-portion body, and

wherein a distal end of the wall surface of the other wall is disposed closer to the distal end side of the distal-end-portion body than a distal end of the wall surface of one wall.

12. The endoscope according to claim 4 ,

wherein the wall surface of the other wall of the pair of walls is longer than the wall surface of the one wall in the axial direction of the distal-end-portion body, and

wherein a distal end of the wall surface of the other wall is disposed closer to the distal end side of the distal-end-portion body than a distal end of the wall surface of one wall.

13. The endoscope according to claim 5 ,

wherein the wall surface of the other wall of the pair of walls is longer than the wall surface of the one wall in the axial direction of the distal-end-portion body, and

wherein a distal end of the wall surface of the other wall is disposed closer to the distal end side of the distal-end-portion body than a distal end of the wall surface of one wall.

14. The endoscope according to claim 6 ,

wherein the wall surface of the other wall of the pair of walls is longer than the wall surface of the one wall in the axial direction of the distal-end-portion body, and

wherein a distal end of the wall surface of the other wall is disposed closer to the distal end side of the distal-end-portion body than a distal end of the wall surface of one wall.

15. The endoscope according to claim 7 ,

wherein the wall surface of the other wall of the pair of walls is longer than the wall surface of the one wall in the axial direction of the distal-end-portion body, and

wherein a distal end of the wall surface of the other wall is disposed closer to the distal end side of the distal-end-portion body than a distal end of the wall surface of one wall.

16. The endoscope according to claim 1 ,

wherein the flat surface is inclined toward the space.

17. The endoscope according to claim 1 ,

wherein one wall includes an inclined surface inclining from the flat surface toward the space.

18. The endoscope according to claim 1 ,

wherein the observation window is disposed in a recessed portion provided on the flat surface.

19. The endoscope according to claim 1 , further comprising:

a port that is provided on the wall surface of the one wall and ejects the washing water; and

a branch pipe line that connects the port to the fluid pipe line.

20. The endoscope according to claim 19 ,

wherein the wall surface of the other wall is positioned on an extension of the ejection direction of the washing water to be ejected from the port in a state in which the standing base is in the falling position.