A golf swing training tool including an arm band (which connects the elbows) and the club shaft are connected by a cord maintain a prescribed grip angle. The arm band is configured to adjust a distance between the elbows. An elastic clip locks onto the club shaft and is configured to encircle the club shaft, and enables easy changing of the grip angle by using an opening lever to change the locking point with a single touch. As a result, frequent changes in grip angle can be made much more easily. Three types of cords are employed, a low-elasticity cord, a high-elasticity cord, and a cord combining both are used to achieve twelve different types of training methods.