A corrugated clamp includes a base section, a lid section, and a bracket section. The base section and lid section are provided on their inner peripheral surfaces with concavo-convex portions to be fitted to an annular concavo-convex portion of a corrugated tube. The bracket section projects from an exterior of the base section to be engaged with a vehicle body. A ground wire is drawn out from a wire harness extending through the corrugated tube. A core wire is exposed from the ground wire by stripping an insulation sheath of the ground wire. The exposed core wire is brought into contact with an inner surface of the concavo-convex portion of the base section and is fixed between the inner surface of the base section and an outer surface of the corrugated tube. An latch piece projected from and integrated with a vehicle body panel is inserted into and engaged with the bracket section to contact the bracket section and the vehicle body panel with each other, thereby electrically connecting the ground wire to the vehicle body panel.