Seat back for vehicle and seat for vehicle including the same

摘要

A waist receiving portion, which is provided at a support member, is curved to form a convex shape toward a front side in a seat front and rear direction in side view. Accordingly, when a waist portion of an occupant is pressed against the waist receiving portion, the change of the shape of lumbar vertebrae is suppressed. For this reason, since it is possible to reduce the difference between a timing when a head portion of the occupant is pressed against a headrest and a timing when a neck portion of the occupant is pressed against a neck receiving portion, it is possible to suppress swing of the head portion of the occupant about the neck portion as a fulcrum in the seat front and rear direction. Therefore, a burden to the neck portion of the occupant is reduced.

主权项

1. A seat back for a vehicle comprising:
a seat back frame, including:
a pair of seat back side frame portions, the seat back side frame portions being disposed respectively at both sides in a seat width direction and each of the seat back side frame portions extending in a seat height direction, anda seat back upper frame portion which connects upper end portions of the pair of seat back side frame portions along the seat width direction and on which a headrest is mounted; a support member that is mounted on the seat back frame; and a waist receiving portion that is provided at the support member, the waist receiving portion being curved to form a convex shape toward a front side in a seat front-rear direction in side view, and supporting a waist portion of an occupant when a load having a predetermined value or more is applied to the occupant toward a rear side in the seat front-rear direction, wherein the waist receiving portion includes a corrugated shape portion whose cross-section, in a seat-width direction, is a corrugated shape, and the corrugated shape comprises alternating concave and convex recesses in the seat-width direction.