To improve workability and assembling precision by performing work while maintaining a state where a linear body is not slack when function components are attached to the linear body in the positions separated from the reference position at the specified distance, connecting a linear body assembling auxiliary tool.

In an assembling figure 10, U-jigs 11, 12 for holding an electric wire E by U-shaped parts 11a, 12a are erected on a board P at a distance L shorter than the distance between connectors C1, C2, and positioning jigs 13 for holding a binding band B with a clip A are erected at distances L1, L2 from the U-jig 11 (the reference position). A U-shaped member 12b facing a U-shaped member 12a through a pair of springs 14 is provided on the side separated from the U-jig 11 of the U-shaped part 12a, the connector C2 of the electric wire E to be held is energized by the U-shaped member 12b in the direction separated from the U-shaped part 11a, and the connector C1 is stopped by the U-shaped part 11a.