To provide an assembly jig for linear bodies, which can facilitate the reuse, correction, conveyance and storage of an assembling board.

A base part for positioning and fixing a U-shaped part 13 of a U-shape jig adapted to be set up on an assembling board 3, is composed of two components, that is, a columnar part 16 for supporting the U-shape part 13 and a fixing block 15 fixed to the assembling board 3. The columnar part 16 is provided in tits lower part with a T-shape part 17, and the fixing block 15 is formed therein with an insertion groove 18 which has a cross-sectional shape the same at that of the T-shape part 17 of the columnar part 16, and in which the T-shape part 17 inserted through an insertion port 18a is clockwise rotated in an allowable space 18c by 1/4 turn, and is then inserted n a fixing grove 18c so as to grip the columnar part 16. Further, a pin 19 to be driven into and fixed to the assembling board 3 is planted to the bottom surface of the fixing block 15.