Endoscope

An endoscope comprising:

• an inserted portion that is inserted into a body;
• an observation optical system that is provided at a distal-end portion of the inserted portion and that acquires an image of the body interior;
• and
• a supporting expansion portion that makes an organ inside the body support the distal-end portion of the inserted portion and that is provided with a first expanding member, which is provided closer to a base-end portion than the distal-end portion of the inserted portion is, and a second expanding member, which is provided so as to overhang forward from the distal-end portion of the inserted portion,
• wherein, when viewing a cross-section perpendicular to a center axis of the inserted portion, the first expanding member is disposed on the opposite side from the second expanding member, with the inserted portion interposed therebetween.