Provided is a frame which serves as the seatback frame for a vehicle seat, and is capable of reducing the load imparted on a seated passenger during instances of vehicle impact by using a simplified configuration. A seatback frame (1) equipped with a connecting wire (21) for connecting sideframes (15), wherein: the center section of the connecting wire (21) is bent so as to extend forward of the vehicle seat (S); and when a vehicle rear end collision occurs and the seated passenger moves in the vehicle seat (S) rearward direction, said forward-extending section presses on the passenger-back section where the thoracic vertebrae are located, and reduces the amount of rearward movement of said back section.
