SEATBACK FRAME AND RESIN FOR EMPLOYING IN A SEATBACK FRAME

There is provided a seatback frame (22) integrally formed by resin molding, the seatback frame including: an upper side frame section (30) that includes a headrest retaining portion that extends along a seat width direction; a pair of side frame sections (28) that extend along a seat up-down direction; and a reinforcing section that is formed in the upper side frame section by forming plural recessed portions, at least from the headrest retaining portion to the seat width direction end portion, wherein at least one or more of the recessed portions is open toward the seat rear side so as to provide a first wall face at the seat front side; and another one or more of the recessed portions is open toward the seat front side so as to provide a second wall face at the seat rear side.