A swing-out workbench extension for a workbench includes a rectangular swinging platform and four swinging upright members having equal lengths and each pivotably connected at the lower ends thereof to the rectangular platform, two on each side thereof. The four swinging upright members are pivotably mounted on the underside of a bench top of a workbench so that the rectangular swinging platform is movable between a stored position hanging below the bench top and an upper extended position generally adjacent a bench top. The rectangular platform extends at all times in a generally horizontal plane whereby tools mounted on the rectangular swinging platform are retained thereon, and a latch is provided for releasably locking the rectangular swinging platform in the upper extended position.