To provide a binding tool enabling easy handling with small reaction of a rotary output to twist a wire since a worker needs to hold the tool by large force to prevent a case where a hand of the worker is twisted by the reaction when rotating a binding bit by using a conventional electric screw driver in the binding tool suitable for a work for binding a reinforced cross intersection part by the wire before placing concrete of a building floor, etc.

This binding tool is provided with a rotary impact mechanism 10 for rotating the binding bit B by intermittently imparting impact in a twisting direction of a binding member. Since the impact is intermittent, reaction applied to the hand can be reduced.