| 摘要 |
PROBLEM TO BE SOLVED: To provide a folding door capable of opening an entrance widely and narrowly when necessary without hindering entrance. SOLUTION: This folding door is provided with a framework 2, a wide main double-panel folding door body 4, a narrow auxiliary double-panel folding door body 5, and a coupling mechanism 6 for coupling the main double-panel door body 4 and the auxiliary double-panel door body 5 with each other freely to be turned. The main double-panel door body 4 and the auxiliary double-panel door body 5 are formed freely to be opened and closed between the opening condition that they are folded and the closing condition that they are expanded on a straight line.
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