PURPOSE: To prevent a pipe from being deformed into a flat state when it is wound by deforming the pipe into a flat state before winding the pipe on a winding drum so that the pipe is formed into a true round shape by the deformation generated when the pipe is wound on the winding drum.

CONSTITUTION: A pipe P passes between caliper rollers 21 of a flattening device 20 before the pipe P is wound on a winding drum 10, thus the pipe P is flattened in the vertical direction. When a driving drum 30 presses the pipe P to the winding drum 10, the rotation of the driving drum 30 is transferred to the winding drum 10 via the pipe P, and the winding drum 10 is rotated. A sheet-shaped cushion member 40 is wound on the outside of the wound pipe P. The pipe P is wound on the outside of the cushion member 40. The pipe P is wound in a line along the opposite direction to the winding direction of the previously wound pipe P along the axial direction of the winding drum 10.