Provided is a cushion set including a pad, a filling pad, an envelope, and a support pad set. The pad has a first-tier sunken portion and a second-tier sunken portion. The filling pad is disposed in the second-tier sunken portion. The envelope is disposed on the pad. The envelope has a pocket-shaped body. A plurality of coupling portions is disposed at edges of the body. The support pad set includes an upper foam pad, a lower foam pad, and a soft gel pad. The support pad set is disposed in the body of the envelope. The soft gel pad corresponds in position to the filling pad of the second-tier sunken portion of the pad.