Abstract: There is provided a seatback frame including: left and right side frames that are provided at left and right side portions of a seatback of a vehicle seat, with the respective lower end portions of the side frames coupled to a rear end portion of a seat cushion frame provided to a seat cushion of the vehicle seat; and a back face panel that is formed of sheet metal, that spans across between rear end portions of lower portions of the left and right side frames with its thickness direction along a seatback front-rear direction, that is fixed to the left and right side frames, and that includes an undulating shaped portion bent such that peaks and troughs alternate in a row along a seat width direction.

Abstract: In a vehicle seat, beads are formed to a SC panel, and the beads extend along the seat front-rear direction adjacent to joint portions at seat width direction insides of the joint portions. When repeated load in the seat up-down direction is input to a seat width direction intermediate portion of the SC panel, for example, the SC panel is displaced by the input load in the seat up-down direction, and tensile load in the seat width direction acts on the beads as a result. The beads extend or contract in the seat width direction due to the tensile load. Load input to the SC panel is thereby absorbed by the extension and contraction of the beads, and load in the seat up-down direction input to the joint portions is reduced. This enables concentration of stress at the joint portions to be suppressed.

Abstract: There is provided a seatback frame including: left and right side frames that are provided at left and right side portions of a seatback of a vehicle seat, with the respective lower end portions of the side frames coupled to a rear end portion of a seat cushion frame provided to a seat cushion of the vehicle seat; and a back face panel that is formed of sheet metal, that spans across between rear end portions of lower portions of the left and right side frames with its thickness direction along a seatback front-rear direction, that is fixed to the left and right side frames, and that includes an undulating shaped portion bent such that peaks and troughs alternate in a to along a seat width direction.

Abstract: In a vehicle seat (10), beads (42) are formed to a SC panel (30), and the beads (42) extend along the seat front-rear direction adjacent to joint portions (40) at seat width direction insides of the joint portions (40). When repeated load in the seat up-down direction is input to a seat width direction intermediate portion of the SC panel (30), for example, the SC panel (30) is displaced by the input load in the seat up-down direction, and tensile load in the seat width direction acts on the beads (42) as a result. The beads (42) extend or contract in the seat width direction due to the tensile load. Load input to the SC panel (30) is thereby absorbed by the extension and contraction of the beads (42), and load in the seat up-down direction input to the joint portions (40) is reduced. This enables concentration of stress at the joint portions (40) to be suppressed.