Bending portion of endoscope, endoscope, and manufacturing method of bending portion of endoscope

A bending portion for use with an endoscope, comprising:

• a plurality of bending pieces, wherein adjacent bending pieces of the plurality of bending pieces are rotatably coupled to each other by at least one coupling fastener;
• a wire configured to transmit a traction operating force to a first bending piece included in the plurality of bending pieces;
• and
• a pin located in a first hole in the first bending piece,
• wherein a first end portion of the pin protrudes from the first hole past an outer circumference surface of the first bending piece,
• wherein a second end portion of the pin protrudes from the first hole past an inner circumference surface of the first bending piece,
• wherein a third portion of the pin is between the first end portion and the second end portion, and the third portion of the pin contacts a surface of the first hole,
• wherein the first end portion has a first width dimension that is larger than an opening dimension of the first hole, and
• wherein the wire is attached to the second end portion.