A skin for a seat back of a vehicle seat includes a rear upper piece arranged on the upper rear surface of the seat back, and a rear lower piece arranged on the lower rear surface of the seat back. The rear upper piece has a rear upper piece pocket portion that extends downward in front of the rear lower piece. A left end portion, a right end portion, and a lower end portion of the rear upper piece pocket portion are sewn to the rear lower piece to form a pocket, and an opening of the pocket is formed between the upper end portion of the rear upper piece pocket portion and the rear lower piece. The rear upper piece and the rear lower piece are sewn together at a seam that extends laterally from the opening of the pocket.