A fastening tool comprising: a cylindrical rotation guide member extending in one direction and rotatably supported; a holding member having an opening to which a driver bit is detachably inserted, and configured to move in an axis direction along the extension direction of the rotation guide member inside the rotation guide member and to rotate together with the rotation guide member; and a moving member configured to move the holding member in a front and rear direction along the rotation guide member; wherein the moving member comprises: a first moving member connected to the holding member and configured to rotate together with the holding member and the rotation guide member and to move in the axis direction along the rotation guide member, and a second moving member configured to rotatably support the first moving member and to move in the axis direction along the rotation guide member; characterised in that the rotation guide member has a groove portion extending in the axis direction, wherein the holding member and the first moving member are connected via a connecting member configured to enter the groove portion, wherein the connecting member is supported in the groove portion so as to be movable along the axis direction of the rotation guide member, and wherein a rotation operation of the rotation guide member is able to cause the connecting member to be pushed by one side surface or the other side surface of the groove portion according to a rotation direction of the rotation guide member, and to be applied with a force in a circumferential force from the rotation guide member. a cylindrical rotation guide member extending in one direction and rotatably supported; a holding member having an opening to which a driver bit is detachably inserted, and configured to move in an axis direction along the extension direction of the rotation guide member inside the rotation guide member and to rotate together with the rotation guide member; and a moving member configured to move the holding member in a front and rear direction along the rotation guide member; wherein the moving member comprises: a first moving member connected to the holding member and configured to rotate together with the holding member and the rotation guide member and to move in the axis direction along the rotation guide member, and a second moving member configured to rotatably support the first moving member and to move in the axis direction along the rotation guide member; characterised in that the rotation guide member has a groove portion extending in the axis direction, wherein the holding member and the first moving member are connected via a connecting member configured to enter the groove portion, wherein the connecting member is supported in the groove portion so as to be movable along the axis direction of the rotation guide member, and wherein a rotation operation of the rotation guide member is able to cause the connecting member to be pushed by one side surface or the other side surface of the groove portion according to a rotation direction of the rotation guide member, and to be applied with a force in a circumferential force from the rotation guide member. a first moving member connected to the holding member and configured to rotate together with the holding member and the rotation guide member and to move in the axis direction along the rotation guide member, and a second moving member configured to rotatably support the first moving member and to move in the axis direction along the rotation guide member; characterised in that the rotation guide member has a groove portion extending in the axis direction, wherein the holding member and the first moving member are connected via a connecting member configured to enter the groove portion, wherein the connecting member is supported in the groove portion so as to be movable along the axis direction of the rotation guide member, and wherein a rotation operation of the rotation guide member is able to cause the connecting member to be pushed by one side surface or the other side surface of the groove portion according to a rotation direction of the rotation guide member, and to be applied with a force in a circumferential force from the rotation guide member.