Chair

The utility model provides a chair comprising a seat and legs arranged below the seat, wherein the legs include two front legs rotatably connected to the front part of the seat and two rear legs located at the rear part of the seat; the bottom between each front leg and each rear leg arranged at the same side of the seat is provided with a cross bar; the seat is connected with each rear leg through an elastic expansion link; and one ends of the elastic expansion links are rotatably connected to the rear legs, and the other ends of the elastic expansion links are rotatably connected to the seat. The chair is elastic, movable, capable of effectively relieving the aching pain feel caused by sitting for a long time, relaxing the body and effectively increasing the work and study efficiencies, more comfortable, simple in structure as well as economic and practical.