Abstract: A neck rod member for stringed instruments, particularly for a bass guitar, includes two rod portions which extend parallel to each other and are mounted one above the other. The first ends of the rod portions are fixedly connected to each other. An adjustment device is mounted on the second ends of the rod portions for effectively shortening the length of one of the rod portions relative to the effective length of the other of the rod portions, so that a corresponding bending force is imparted on the neck rod member. The adjustment device includes a threaded shaft attached to the second end of one of the rod portions and an adjusting nut mounted with threaded engagement on the threaded shaft. A follower member is mounted on the second end of the other of the rod portions. The follower member is in driving engagement with the adjusting nut in axial direction of the neck rod member.