To provide an auxiliary device for safely, easily and conveniently carrying out a work in manually-rotating a cylindrical rotating body as typified by a rotary barrel of a tubular-type wire-twisting machine.

The auxiliary device used when rotating the cylindrical rotating body by hand has a holding part, and a rotational-axis-force transmitting part attached onto a tip end of a foot extending from the holding part. Accordingly, an input force from the holding part is transmitted to the cylindrical rotating body to forcibly rotate the cylindrical rotating body.