| 摘要 |
PROBLEM TO BE SOLVED: To provide an endoscope for preventing outflow of water in an air supply state by a simple and small-sized structure.SOLUTION: In an endoscope, an air pipeline 210 where air passes through and a water pipeline 240 where water passes through are merged at a merging part 100, and air or water is made to pass through air/water pipeline 270. A shape in a plane where the first center axis 130 in common for the air pipeline 210 and the air/water pipeline 270 and the second center axis 160 of a connection pipeline 152 positioned at the merging part of the water pipeline pass through becomes as follows. For a first tangent 162 at the intersection with the air/water pipeline 270 of the inner wall of the air/water pipeline 270 of the connection pipeline 152, a first angle &thetas;1 formed by a half line on the first center axis 130 coming out to the side of the air pipeline 210 from a first intersection 164 which is the intersection of the first center axis 130 and the first tangent 162 and a half line on the first tangent 162 coming out to the side of the connection pipeline 152 from the first intersection 164 is an obtuse angle. |
