A workpiece elevating support device which can be utilized by being installed in a carriage-type conveying apparatus for conveying an automobile body while changing the height thereof in each section in an automobile assembly line. The workpiece elevating support device includes at least two center-folding double link mechanisms arranged in parallel on a base, each of which is composed of a lower parallel link, an intermediate link member, an upper parallel link, and an upper link member. The upper link member is consecutively provided with a workpiece support. There is juxtaposed a lock to hold the center-folding double link mechanisms in an expanding-rising posture, which is taken when the upper link members are vertically raised to a predetermined height.