Endoscope

An endoscope comprising:

• an insertion section configured to be inserted into a subject;
• a bending section disposed on a distal end side of the insertion section and bendable in at least one bending direction;
• a distal end member disposed on a distal end side of the bending section and provided with an opening that allows a treatment tool to project outward therefrom;
• a tube inserted into the bending section to allow the treatment tool to be inserted into the tube, the tube having at least two trench portions on an inner surface of a distal end side of the tube;
• and
• a connector having a central axis and at least two projecting portions of elongated shape on one end of the connector, the at least two projecting portions projecting along the central axis, the connector connecting the distal end member and the tube so that the other end of the connector is fixed to the distal end member and the at least two projecting portions are respectively fitted into the at least two trench portions of the tube, thereby to allow the treatment tool inserted into the tube to project from the opening of the distal end member.

An insertion section for use with an endoscope, the insertion section being configured to be inserted into a subject, the insertion section comprising:

• a bending section disposed on a distal end side of the insertion section and bendable in at least one bending direction;
• a distal end member connected to a distal end side of the bending section and having a treatment tool passage to allow a treatment tool to project outward from the distal end member;
• a tube inserted into the bending section to allow the treatment tool to be inserted into the tube, the tube having at least two trench portions on an inner surface of a distal end side of the tube;
• and
• a connection section having a central axis and having one end fixed to the distal end member so as to be communicated with the treatment tool passage, the connection section having at least two projecting portions, each having an elongated shape, at the other end of the connection section, the at least two projecting portions projecting along the central axis so as to be respectively fitted into the at least two trench portions of the tube.