Bending piece and bending portion of medical device, and endoscope

A bending piece of a medical device, comprising:

• a ring-shaped piece main body having a peripheral wall part of which a cross-section orthogonal to an axial direction is formed in a C-like shape and a slit-shaped opening part extending in the axial direction and provided between one end and the other end of the peripheral wall part in a peripheral direction;
• a first extension body extending from the peripheral wall part to one side in the axial direction;
• a second extension body extending from the peripheral wall part to the other side in the axial direction;
• a connecting shaft provided on the first extension body and provided so as to extend outward in a radial direction orthogonal to the axial direction;
• and
• a connecting hole formed in a direction parallel to the connecting shaft and having a hole shape corresponding to an outer shape of the connecting shaft, the connecting hole being provided in the second extension body;
• and
• a pair of wire insertion holes formed within the peripheral wall part and the second extension body along the axial direction,
• wherein a number of the first extension body is one and a number of the second extension body is one.