PURPOSE: To provide a door allowing a winding operation and having flexibility and high durability.

CONSTITUTION: This door has a sheet member 1 fastened between two soft surface sheets 3 having the prescribed horizontal length and bonded to each other in vertical posture, via many strip core materials 2 laid at suitable intermittent intervals in a vertical direction from the upper end to the lower end of the sheets 3, and overhead and floor rails coupled to the upper and lower ends of the sheet member 1 for guiding the travel of the core materials 2. In addition, a spiral storage track section is made continuous to a pull-out track section at the outermost section of the spiral track.