To provide a novel winding structure of an outer panel which prevents separation or deviation of the outer panel.

In a winding structure of an outer panel made by winding panel materials aound a pipe so as to link each other in the longitudinal direction of the pipe, both end parts of the outer panel 10 in the pipe longitudinal direction include: seam parts 11 and 12 which are bent at an acute angle and can be engaged with each other; and a seam connection part 17 formed by superposing the adjacent outer panel 13 and seam part 14 one on the other, forming a cut 16 on one site of the seam parts 11, 12 and 14, and folding a part of the seam parts 11, 12, and 14 superposed via the cut 16.