Patent ID: 8459747

Claim:
A vehicle seat with a seat belt, comprising: a seat back frame having at least a pair of side frames, and an upper frame for coupling the pair of the side frames on an upper side; a shoulder anchor portion provided in an upper part of one of the side frames, the shoulder anchor portion into which a shoulder belt portion of the seat belt is inserted; and a reclining device provided on a lower side of the one of the side frames; wherein: the one of the side frames has a closed section structure portion having a hollow closed section, and an extension portion integrally formed by downwardly extending a surface of the closed section structure portion positioned on an outer side of the seat; the reclining device is attached to the extension portion; the extension portion is formed into a flat plate; a lower end of the extension portion extends below a lower end of the closed section structure portion; the closed section structure portion is provided with an opening at the lower end; and a reinforcing member having a U shape section is fixed on an inner side surface of the extension portion and to the opening of the closed section structure portion.