To obtain a binding tool wherein working efficiency can be improved, fastening force is uniform, and a length of a binding tie required for binding can be much shorter than a conventional one.

The binding tool comprises a trigger lever 64 with a base end pivoted on a grip 62, an arm member 83 forming an installation part 84 of a binding tie provided in front of a casing 60 and including a table 85 for receiving an object A to be bound, a driving member 67 interlocking with the trigger lever 64, an actuation hook member 81 pivoted following the activation of the driving member, a push-up member of the binding tie interlocking with the actuation hook member, a tension adjust spring 71 including an adjust knob, a tension bar 75 with an end connected with the tension adjust spring, a sliding part 69 connected with the other end of the tension bar, a clamp 89 for an excessive part of the binding tie provided in front of the sliding part, a lever board 92 with a rear end tension-applied and pivoted in conjunction with the driving member 36, and a cutter 95 provided at the tip of the lever board.