A door locking device comprising a six-sided right wedge frustum having two spaced parallel sides and parallel upper and lower bases with a first remaining side perpendicular to the upper and lower bases and a second remaining side cut at an angle with respect to the upper and lower bases. The device is securely placed between the door handle stem and the key latch to prevent the latch from rotating if an intruder attempts to place a key in the lock and rotate the tumblers, since the latch is connected directly to the tumblers.