Endoscope

1. An endoscope comprising:

an insertion portion which includes a distal end and a proximal end;

an operation portion which is provided on a proximal end side of the insertion portion and includes an operating member;

a distal end portion body which is provided on a distal end side of the insertion portion;

a rotating shaft which is rotatably supported in the distal end portion body;

an elevator which is coupled with one end of the rotating shaft;

an elevator erecting lever which is coupled with the other end of the rotating shaft;

an operating wire which includes a proximal-end-side coupling portion coupled with the operating member and a distal-end-side coupling portion coupled with the elevator erecting lever, the operating wire configured to rotate the rotating shaft through the elevator erecting lever by operation of the operating member to erect the elevator;

a partition wall which includes a holding hole to support the rotating shaft, is a part of the distal end portion body and is provided between the elevator and the elevator erecting lever; and

a seal member which is disposed between the holding hole and the rotating shaft, wherein:

the rotating shaft includes a first rotating shaft and a second rotating shaft;

the first rotating shaft has one end connected with the elevator erecting lever and another end provided with a first coupling portion;

the second rotating shaft has one end that is integrally formed with the elevator or connected with the elevator by welding of the one end and the elevator, and another end provided with a second coupling portion which is coupled with the first coupling portion in a relativity unrotatable manner; and

a coupling position in which the first coupling portion and the second coupling portion are coupled with each other is disposed on a side of the elevator erecting lever with respect to the seal member.

2. The endoscope according to claim 1 , wherein:

any one of the first coupling portion and the second coupling portion has a convex portion that projects in an axis direction of the rotating shaft;

another one of the first coupling portion and the second coupling portion includes a concave portion that is concave in the axis direction of the rotating shaft; and

the first rotating shaft and the second rotating shaft are coupled in a relatively unrotatable manner by fitting the convex portion and the concave portion to each other.

3. The endoscope according to claim 1 , further comprising

a positioning portion configured to position the seal member in an axis direction of the rotating shaft,

wherein the positioning portion includes a first engagement portion provided in the second rotating shaft and a second engagement portion provided in the seal member, and positions the seal member in the axis direction by engaging the first engagement portion and the second engagement portion with each other.

4. The endoscope according to claim 1 , further comprising

a positioning portion configured to position the seal member in an axis direction of the rotating shaft,

wherein the positioning portion includes a first engagement portion provided in an inner wall surface of the holding hole of the partition wall and a second engagement portion provided in the seal member, and positions the seal member in the axis direction by engaging the first engagement portion and the second engagement portion with each other.

5. The endoscope according to claim 1 , wherein the second rotating shaft has one end connected with the elevator in an airtight manner without a gap.

6. The endoscope according to claim 1 , wherein an axis passes through rotation centers of the first rotating shaft and the second rotating shaft.

7. The endoscope according to claim 2 , wherein the coupling position at which the convex portion and the concave portion are fitted to each other is positioned in the holding hole.