A vehicle seat includes: a seat back; a rear frame provided in the seat back and configured to have a substantially rectangular shape; and a retractor provided in the seat back and configured to retract a seat belt, wherein the rear frame includes a first side member and a second side member extending in a vertical direction, a connecting member extending in a widthwise direction, and a bracket for mounting the retractor, and wherein the connecting member and one of the first side member and the second side member are coupled together with the bracket at a corner portion of the rear frame.