Patent ID: 8528982

Claim:
A seat provided with a seat cushion section and a seat back section, the seat comprising: a cushion frame disposed in the seat cushion section, the cushion frame including a pair of side frames, each of the side frames including an inner frame and an outer frame, the inner frame and the outer frame being made of a metal plate and having flanges extending along peripheral edges thereof; and a cushion member, the cushion member including at least one approximately U-shaped engaging plate, wherein the inner frame and the outer frame face each other with a space therebetween at least partially, and the flanges of the inner frame and the outer frame are fixed to each other along an entirety of the peripheral edges via a hemming process, wherein an expanded bead body is inserted entirely or partially in the space between the inner frame and the outer frame of each side frame, and the expanded bead body and one of the inner frame and the outer frame are at least partially stuck to each other on faces thereof opposite to each other, wherein the flanges of the inner frame and the outer frame are bent outward with respect to a center of the cushion frame, and wherein the at least one approximately U-shaped engaging plate attaches to the flanges of the inner frame and the outer frame.