A seat assembly includes a pad body having front and rear end portions, and a supporting member secured to the pad body. The supporting member includes a frame having front and rear end portions, a front resilient unit extending from the front end portion of the frame and disposed between the pad body and the frame, and a rear resilient unit extending from the rear end portion of the frame and disposed between the pad body and the frame. The front and rear resilient units support the front and rear end portions of the pad body, respectively.