Abstract: A golf swing training device comprises a mounting bracket positioned on the shaft of a golf club, a fastener which has a threaded shank engaged with the bracket and an enlarged head, a rod which extends through an aperture in the head, and a clamping sleeve received on the head between the bracket and the rod. The fastener cooperates with the bracket and the sleeve to releasably secure the bracket to the club shaft with the rod in an extending position. The position of the rod is adjusted so that a free end of the rod touches one shoulder of a golfer when he has executed a proper backswing.