| 摘要 |
A duct coupler for a flexible duct is provided to form protrusion parts or groove parts along an outer peripheral surface for reducing deviation of a flexible duct. A duct coupler for a flexible duct includes an outer peripheral surface formed with holding parts for holding an end of the flexible duct, wherein the holding parts are grooves(5) or protrusions. By the grooves, groove-corresponding parts(7) of the flexible duct are stably fixed to the grooves, so that the coupling between the duct coupler(2) and the flexible duct(3) is kept stably.
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