A stroke correcting device which includes an arm device having arm pads attached thereto and a golf club fixing device for fixing a putter or an iron golf club Thereto, wherein the arm device has the function of adjusting the distance between right and left arms, the function of adjusting a positional relation between right and left arms, the function of adjusting an angle in the arm device, the function of adjusting the angle formed by the arm device and the golf club fixing device and the function of adjusting the angle formed by the arm device and the golf club.