A sit assist device (1) comprising a base (2) adapted to be supported by a seating surface, and a sitting platform (3) hingedly connected to the base (2) and movable between a raised position and a lowered position to assist a user to sit down onto and to stand up from the sitting platform (3). A primary biasing means (4) provides a primary resilient bias to resiliently bias the sitting platform (3) from the lowered position to the raised position over an operating range, thereby moving the sitting platform (3) from the lowered position to the raised position over the operating range as the user stands up from the sitting platform (3) and slowing the movement of the sitting platform (3) from the raised position to the lowered position over the operating range as the user sits down onto the sitting platform (3). A secondary biasing means (5) provides a secondary resilient bias to supplement the primary resilient bias over a portion of the operating range adjacent the lowered position.