To reduce the gross weight of a vehicle to reduce manufacturing cost, in a pipe material applied to a stay or the like of a vehicle head rest.

A pipe material 1 includes a cylindrical barrel 2, and a molding part 3 disposed on a leading end of the barrel 2. An outer peripheral curved surface 2c of a part contiguous from the barrel 2 to the molding part 3 is molded to a curved surface of at least a predetermined radius of curvature R1. An extreme end part 3a on an outer peripheral surface of the molding part 3 is situated more inward than a pipe end face P toward a pipe shaft center CT1. Thus, nobody is injured regardless of contact with an end of the pipe material 1.