A training device for a putting stroke in the game of golf. A base and sidewalls form a track which defines the path of the stroke. A guide attached to the putter head fits within the track and prevents the putter head from binding in the track and thus directs the putter head along the track causing the golfer to keep proper wrist alignment and to build muscle memory when properly stroking the ball. One version of the track permits the width of the track to be adjusted to accommodate putters having different sized heads. Further, a portion of the track may be adjusted to train a putting stoke having a slightly curved backswing.