Seat energy absorption device

The seat energy absorption device (10) has seat energy absorption unit (14) that absorbs primary acceleration movement of backrest unit (12) in a crash situation. The seat energy absorption unit is moved along the direction deviated from the primary acceleration movement of the backrest unit in the crash situation. The seat energy absorption unit is provided with attachment point (16) for attaching the seat energy absorption unit to transverse reinforcement unit (18). An independent claim is included for seat.