Chair seat and chair

The utility model relates to the technical field of chairs, in particular to a chair seat and a chair. The chair seat comprises a cushion, the cushion is made of soft elastic materials, inflation and deflation type air bags are arranged in the left side, the right side and at least part of the edge area of the rear side of the cushion, the inflation and deflation type air bags are connected with inflation and deflation parts, each inflation and deflation part comprises an inflation pipe, an inflation ball and a one-way deflation valve, one end of each inflation pipe is connected with the corresponding inflation and deflation type air bag, and the other end of each inflation pipe is communicated with the corresponding inflation ball. The one-way deflation valve is arranged at the connecting end of the inflation ball and the inflation pipe or on the inflation pipe, the inflation and deflation type air bag expands or contracts and deforms through inflation and deflation operation, the edge areas located on the l