Abstract: The training device is comprised of two vertically mounted separated rods, which are connected by two strings. The vertically erected rods have two component structures, namely a base rod subsection and a height adjustable rod subsection. Each rod comes with a rotatable hook that can be mounted in slits to hook to the two strings. The rods are equipped with a bubble level on their top to adjust for a perpendicular mounting position. The ball is placed on the ground immediately under the lower one of two strings which serve as a sightline by which the direction of the swing of the putter is defined and to which the striking face of the putter is perpendicularly maintained.