Abstract: The snow ski machine is a snow ski exerciser and teaching aid device which simulates the total motion of downhill parallel skiing minus forward motion consisting of two parallel simulated skis resting on a swivel near the skier's feet with said swivel being a pivot between the skis and a cart which follows two parallel rails horizontally moving from side to side by means of the shifting and transfer of the skier's weight with said cart pulling against two springs mounted on the center front and center back of the cart while the front of the skis rest unattached in guides which follow the angle of the skis on a pivot as the skier moves on the skiing device from side to side.