The invention provides a bar chair capable of aligning rotating axes. A chair seat comprises a soft cushion, and a hard seat and wing-shaped corners are arranged on the bottom surface of the soft cushion. The wing-shaped corners are continuously connected with the hard seat to form a sliding rail edge, and an outside edge is formed at the horizontal segment of the sliding rail edge. The bar chair can stipulate the human body leg position so as to align the human body rotating axis with the rotating axis of the bar chair and is long in service life.