An impact wrench includes a motor including a rotor rotatable about a rotation axis extending in a front-rear direction, a spindle rotatable with a rotational force from the rotor, an anvil frontward from at least a part of the spindle and including an anvil shaft and an anvil projection, and a hammer including a hammer projection that strikes the anvil projection in a rotation direction. The anvil shaft includes a first shaft having a circular cross section, a second shaft having a rectangular cross section, and an intermediate portion between the first and second shafts. The second shaft includes four flat portions and four flat portion connectors. Each flat portion has a first edge and a second edge. The intermediate portion includes support portions each connected to the first edge and is connected to the second edge of each flat portion at positions rearward from the support portions.