An appliance for concealing a handgun includes a substantially planar frame of resilient plastic or other material, having dimensions to fit closely inside a cover of a small zippered case such as a notebook case. Integral tabs projecting from either end of the frame engage a pocket inside the cover of the case to hold the frame in place. A holster tab is integral with the body of the frame; the holster tab is shaped and sized to receive a handgun holster spring clip and to hold the holster securely in place. A clip holder tab similarly receives an ammunition clip holder, and is positioned so the clip holder is held adjacent the holster. A handgun is placed in the holster and the case is closed, so the weapon is concealed within the inconspicuous case. Security is improved by a small orifice in the frame near the case's zipper tab; the orifice receives a padlock shackle to lock the case's zipper closed.