Abstract: A metallic interior security device for double doors comprising a plate of sufficient length to extend beyond adjacent door knobs of the double doors. Formed in the plate are longitudinally spaced slots. The slots are elongated in the longitudinal direction of the plate and are disposed along the plate to receive the neck or narrow portions of the adjacent door knobs, respectively. The width of the elongated slots is greater than the diameter of the neck portions of the door knobs to accommodate the neck portions thereof simultaneously, and is of a lesser diameter than the diameter of the enlarged portions of the door knobs to prevent the removal of the door knobs from locking engagement with the plate.