| 摘要 |
PROBLEM TO BE SOLVED: To provide a seat back structure of a vehicular seat in which an occipital part of a seating person can be supported suitably while improving seating comfortableness.SOLUTION: A back frame 11 of a seat back comprises a base frame body 20 and a front side support body 30 which has elasticity receiving a backrest load, The front side support body 30 includes integrally a lower constitution part 31 which is connected to the lower part of the base frame body 20 as rotatable around a horizontal axis line, an elastically-stretching part 33 installed as elastically-stretchable, an upper constitution part 34 which is connected to the upper part of the base frame body 20 as rotatable around the horizontal axis line, and a head rest part 38 which is installed at the center of the upper end part of the upper constitution part 34. When the backrest load acts to the front side support body 30 to rotate the lower constitution part 31 and the upper constitution part 34 around the horizontal axis line and the elastically-stretching part 33 are flexure-deformed backward, the upper constitution part 34 and the head rest part 38 are integrally displaced forward. |
