A conduction path (1) used for a wire harness is equipped with a conductor (2) and an insulator (3). The conduction path (1) includes route restriction sections (A, B) where routes need to be restricted, and other sections (C, D, E) that are sections other than the route restriction sections (A, B). The insulator (3) includes an insulator body (4) formed by extrusion molding and a plurality of thick portions (6) attached to the outer surface (5) of the insulator body (4) afterwards. The thick portions (6) are disposed at positions corresponding to the route restriction sections (A, B).
