Patent ID: 8132862

Claim:
A seat back frame for a vehicle for supporting a seat back, comprising: a first back frame, at which a shoulder belt anchor for supporting one end portion of a seat belt is provided, the first back frame including a closed section portion and an open section portion; a second back frame arranged substantially in parallel with the first back frame; a cross member arranged so as to connect the first back frame and the second back frame; one of a protruding portion or a recessed portion formed at the cross member so as to extend in a longitudinal direction thereof; one of a complementary first recessed surface portion or a first protruding surface portion formed at the open section portion of the first back frame so as to be complementarily connected to the protruding portion or the recessed portion of the cross member, and one of a complementary second recessed surface portion or a second protruding surface portion formed at the second back frame so as to be complementarily connected to the protruding portion or the recessed portion of the cross member.