To provide a staple by which about two to eighty pieces of paper can be bound with light operation force.

The staple 10 includes: a needle crown 10a; and two needle feet 10b which is configured to bend in one direction from the both ends of the needle crown 10a, wherein an outside width dimension L4 of the needle crown 10a is 11.35 mm or more and 11.49 mm or less, a needle wire width L2 is more than 0.50 mm and less than 0.70 mm, a needle wire thickness L3 is more than 0.32 mm and less than 0.49 mm, and a length of the needle feet L1 is 10.0 mm that is less than or equal to the outside width dimension L4 of the needle crown.