<p>Provided is a backrest cushion comprising: a backrest central cushion unit (111) of a backrest cushion unit (110) formed for its height (a) to be lower than the height (b) of a backrest left side cushion (112) and a backrest right side cushion (113) in between the backrest left side cushion (112) and the backrest right side cushion (113); the back left side cushion (112) and the backrest right side cushion (113) formed to be round by making an inclined plane (112a) and an inclined plane (113a) toward the backrest central cushion unit (111) at the center to support the back of a user; an inner cover contact unit (130) formed on the edge of the backrest cushion body (100) to be the border to fold the edge of the backrest cushion body (100); a back folding unit (151) formed by folding the edge of the backrest cushion body (100) backwards; and a sewing line (155) that wrapped and sewed the band unit (153) made from soft synthetic resin by folding the edge.</p>
