BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double folding folding door structure, and more particularly, will be. This is an outer frame having a rectangular shape; An inner frame connected to the inner side of the outer frame by a plurality of hinges and opened / closed in a zigzag form through rollers provided on upper and lower surfaces; A rotatable body having a door connecting axis formed on an upper surface and a lower surface of the inner frame and symmetrical with respect to each other so that the connecting shaft is discharged to the outside, a groove gear is formed on the outer circumferential surface, A housing having a main inserting hole for inserting the rotating body and a guide groove formed on an outer surface of the main inserting hole and having an opening groove formed in the front face thereof, The plate spring is inserted into the guide groove, and the protrusion is engaged with the groove gear of the rotating body. Thus, the rotating body is rotated An angle adjuster that rotates while the protrusions engage and disengage from the groove gear every time the gear is rotated; The angle regulating opening is provided on the upper and lower surfaces of the rotating window provided inside the inner frame and the opening window is opened while the rotating window is pushed to one side so that the inner frame can be opened and folded to one side.
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