Binding structure and binding method

A binding method comprising:

• a step of preparing a first binding band that binds a first binding target and attaches the first binding target to a fixation target, and a second binding band that uses a specific part of the first binding band as a second binding target;
• a first preliminary step of loosely winding the first binding band around the first binding target;
• a second preliminary step of binding the specific part of the first binding band with the second binding band after the first preliminary step;
• and
• a binding step of binding the first binding target with the first binding band after the second preliminary step,
• wherein the first binding band includes:
• a first strap portion wound around the first binding target;
• and
• a first head portion provided at a first end of the first strap portion,
• the first head portion includes:
• a first lock portion that holds an intermediate part of the first strap portion at a first length suitable for binding the first binding target;
• and
• an attachment portion that attaches the first lock portion to the fixation target,
• the second binding band includes:
• a second strap portion that binds the first strap portion and the first head portion together as the second binding target;
• and
• a second lock portion provided at a first end of the second strap portion,
• the second lock portion holds an intermediate part of the second strap portion at a second length suitable for binding the second binding target,
• the first preliminary step, the first strap portion is wound around the first binding target so as to form a gap between the first strap portion and the first binding target,
• in the second preliminary step, the second strap portion is passed through the gap and wound around the first head portion so as to bind the first strap portion and the first head portion with the second strap portion, and
• in the binding step, the first strap portion is tightened such that the first lock portion holds the first length.