Abstract: A golf stance training device is provided for preventing lateral movement of a golfer during a golf swing. Structurally, the device includes a platform for supporting a foot or the golfer and a support for contacting and preventing lateral movement of the golfer's leg. When used on the golfer's rearward leg, the device abuts the forward side of the golfer's foot and the rearward side of the golfer's leg to prevent rearward movement of the rearward leg. When used on the golfer's forward leg, the device abuts the forward side of the golfer's foot and the forward side of the golfer's leg to prevent forward movement of the forward leg.