Abstract: A vehicle seat includes: a seat back, connected with a seat cushion through a recliner, an outlet of a shoulder belt being provided in one shoulder of the seat back, wherein: the seat back includes: a first side frame, arranged on the one shoulder side; and a second side frame, arranged on the other shoulder side; the first side frame includes: a first frame member having a hollow and closed sectional shape; and a plate-shaped bracket which is attached in the recliner; and the bracket includes a joint part which is inserted into a lower end portion of the first frame member and is joined with the lower end portion.

Abstract: A vehicle seat includes: a seat back; and a seat cushion including: a first side frame; a second side frame; a front frame connecting front end portions of the first side frame and the second side frame to each other; and a rear frame connecting rear end portions of the first side frame and the second side frame to each other. The first side frame includes: a frame member including a closed sectional shape part between the front frame and the rear frame; a first reinforcing member being provided between the front frame and the rear frame to pass through an inner side wall and an outer side wall, and being joined with the inner side wall and the outer side wall; and a connection member connecting an end portion of the first reinforcing member with at least one frame of the front frame and the rear frame.

Abstract: A vehicle seat includes: a seat back, connected with a seat cushion through a recliner, an outlet of a shoulder belt being provided in one shoulder of the seat back, wherein: the seat back includes: a first side frame, arranged on the one shoulder side; and a second side frame, arranged on the other shoulder side; the first side frame includes: a first frame member having a hollow and closed sectional shape; and a plate-shaped bracket which is attached in the recliner; and the bracket includes a joint part which is inserted into a lower end portion of the first frame member and is joined with the lower end portion.

Abstract: A vehicle seat includes: a seat back; and a seat cushion including: a first side frame; a second side frame; a front frame connecting front end portions of the first side frame and the second side frame to each other; and a rear frame connecting rear end portions of the first side frame and the second side frame to each other. The first side frame includes: a frame member including a closed sectional shape part between the front frame and the rear frame; a first reinforcing member being provided between the front frame and the rear frame to pass through an inner side wall and an outer side wall, and being joined with the inner side wall and the outer side wall; and a connection member connecting an end portion of the first reinforcing member with at least one frame of the front frame and the rear frame.