<；P>；PROBLEM TO BE SOLVED: To provide a double-type coupling structure of a sheet-fixing channel material comprising subjecting one end part of the sheet-fixing channel material to drawing processing so as to be formed into a male joint part. <；P>；SOLUTION: The double-type coupling structure of sheet-fixing channel material is as follows: at the one end part of the sheet-fixing channel material 1, the side walls 4 at the insides of the two sheet-fixing channels 2 and part of a channel bottom wall 3a are cut off, together with a coupling piece 5, almost perpendicularly from the outer width position of the coupling piece over the length range L required for coupling from the end part； the cross sectional face shapes of the outside walls 4 remaining in the length range L, a curl part 4a and the channel bottom wall 3 are made smaller than the original cross-sectional face shapes by at least the thickness thereof so as to be formed into a male joint part 6； the male joint part 6 is inserted into the inside of the female joint part 1a of the other sheet-fixing channel material 1 having a cross-sectional face shape formed by simply cutting off the sheet-fixing channel material 1 to be coupled into a butting joint. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
