In the conventional X-linked lift mechanism, in the state where the lift frame is lowered, lift drive components occupy a wide area. Therefore, it is difficult to additionally dispose other functional mechanism components. Further, in the configuration wherein the lift frame is raised when the linear actuator acts in the direction to shorten itself, if the linear actuator is broken, the lift frame may drop dangerously.The present invention solves the abovementioned problems by an X-linked lift mechanism having first links 3 and second links 4 constituting an X-linked mechanism between a base frame 1 and a lift frame 2, wherein a drive member 11 pivotally rotatably installed between the other lateral side portions of the second links is connected with boost arms 12 and a drive arm 13 guide members 15 for guiding the moving members 14 installed at the ends of the boost arms are installed on the other lateral side portions of the first links in the length direction and a linear actuator is provided to extend between the other lateral side of the first links and the drive arm.
