Locking elastic piece, sliding rail assembly, seat and vehicle

The utility model discloses a locking elastic piece, a sliding rail assembly, a seat and a vehicle. The locking elastic piece is applied to the sliding rail, the locking elastic piece is provided with a connecting hole, the inner wall of the connecting hole is provided with a first tooth part, the first tooth part comprises at least one tooth, and the at least one tooth of the first tooth part is arranged on the inner wall of the connecting hole in a protruding mode. The connecting hole is configured to allow a connecting piece of the sliding rail to penetrate through and enable the connecting piece to abut against the first tooth part. According to the locking elastic piece, the first tooth part is arranged in the connecting hole, the connecting piece can interact with teeth of the first tooth part during assembly, the limiting effect of the connecting piece on the locking elastic piece is improved, the locking elastic piece is not prone to play and rotate, and the safety and stability of the locking elastic