Back frame

A back frame used in a seatback of a vehicle seat, the back frame comprising:

• a first side frame that is arranged on one end side of the vehicle seat in seat-width directions and that extends in seat up-down directions;
• a second side frame that is arranged on the other end side of the vehicle seat in the seat-width directions and that extends in the up-down directions;
• a first coupling member extending in the seat-width directions and connecting an upper end portion of the first side frame to an upper end portion of the second side frame;
• a recliner provided to change and maintain angles of the first side frame and the second side frame, the recliner being fixed at least to a lower end portion of the first side frame;
• and
• a second coupling member extending in the seat-width directions and connecting the lower end portion of the first side frame to a lower end portion of the second side frame,
• wherein the second coupling member is joined to the first side frame at a front portion of the first side frame and at a rear portion of the first side frame, and
• wherein a front joined area among joined areas between the second coupling member and the first side frame is positioned at a location corresponding to a joined area between the recliner and the first side frame.