Abstract: A collapsible jack comprising a base member, a support member and a ramp member with each member including a plate with side rails coupled to and extending from the plate. Front and rear pivoting mechanisms couple the base, ramp and support members each including upper and lower pivot rods extending perpendicular to the side rails and interconnected by rigid braces. The lower pivot rods have opposite ends journaled in the base side rails, while the opposite ends of the upper pivot rods are journaled in the support side rails. The upper ends of the ramp side rails are journaled to the front upper pivot rod. Openings in the ramp and base members are aligned when the jack is in its upright position to receive a locking bar which locks the jack in the upright position.