The present invention relates to a work lifting and supporting device which can be utilized in such a manner that the work lifting and supporting device is mounted on a platform car type conveyance device which conveys an automobile body in an automobile assembly line while changing the height of the conveyance device for each section of the line. The device includes at least two center-fold double link mechanisms disposed side by side on a base and lock means. Each of the center-fold double link mechanisms comprises a lower parallel link and an upper parallel link. The lower parallel link is arranged between an intermediate link and the base. The upper parallel link is arranged between the intermediate link and an upper link member. Work support bases are provided continuously to the upper link members. The lock means, when the center-fold double link mechanisms are in an expanded upright position when the upper link members (11) are vertically lifted to a predetermined height, holds the double link mechanisms at the expanded upright position.