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.