To provide an automatic winder certainly catching a cut end of a yarn when the yarn is cut off, smoothly carrying out automatic yarn piecing after the cut, and thus effectively carrying out package processing.

The automatic winder includes a rotationally driven traverse drum 8, and a cover member 9 located so as to face a traverse area of the traverse drum 8. The cover member 9 has a yarn catching member 30 including a yarn regulating portion 32 which regulates the cut end of the yarn. The yarn regulating portion 32 is located on at least one side of the traverse area at a position where the yarn regulating portion 32 faces a contact portion 28 between a peripheral surface of the traverse drum 8 and a package P, and formed upright in a direction away from the peripheral surface of the traverse drum 8. An upright distal end of the yarn regulating portion is proximally located to the peripheral surface of the package.