Provided is an electric wire straightening device capable of correcting a twist generated around an axis of an electric wire. An electric wire correcting device includes an electric wire holding part provided rotatably around an axis of the electric wire for holding an electric wire having been withdrawn from an electric wire reel so as to further withdraw the electric wire toward a side opposite to the electric wire reel and, a rotation driving part rotating the electric wire holding part in an twist backing direction opposite to a twist around an axis of the electric wire occurring in the electric wire between the electric wire reel and the electric wire holding part by further withdrawing the electric wire from the electric wire holding part.