Tying machine and method for tying

A binding machine for binding a first object and a second object by using a staple that includes a first leg portion, a second leg portion, and a main body portion connecting the first leg portion and the second leg portion, and that has an opening formed between the first leg portion and the second leg portion, comprising:

• a first displacement portion configured to displace the first leg portion so as to be engageable with the first object;
• and
• a second displacement portion configured to displace the second leg portion so as to surround the second object by using the first leg portion, the second leg portion, and the main body portion, and to be engageable with the first object, wherein
• the first displacement portion includes a first insertion portion into which the first object and the first leg portion are to be inserted, and
• the first insertion portion includes an inner wall surface configured to come into contact with a tip end portion of the first leg portion, and is configured to guide the tip end portion of the inserted first leg portion along the inner wall surface while curving in an arc shape so that the tip end portion surrounds an outer periphery of the first object in a spiral shape to be engaged,
• wherein, in a top view, the second displacement portion is configured to displace the second leg portion to a position where the second leg portion intersects the first leg portion.