SEAT BACK FRAME STRUCTURE OF AUTOMOBILE

摘要

PROBLEM TO BE SOLVED: To provide a seat back frame capable of avoiding a local deformation of an upper frame by effectively dispersing and burdening a force applied from a head rest stay to a whole upper frame. SOLUTION: Upper frames 4, 9 of seat back frames 3, 8 are extrusion-molded to an approximately rectangular closed cross section by a lightweight metal material to enhance a rigidity Since an applying force dispersion means 42 for dispersing a force applied from a head rest stay 2A to the upper frames 4, 9 is provided in the closed cross section, a local deformation caused by a stress concentration of the upper frames 4, 9 can be inhibited at the time of generation of a force applied from the head rest stay 2A.