A firearm security device including a frame to which a fixed plate and a movable plate are attached. A grip pad is attached to each of the opposing inner sides of the fixed and movable plates. A trigger guard stud is attached to and projects from the inner face of the fixed plate. The trigger guard stud inserts through the trigger guard of the firearm. Means are provided for shifting the movable plate from an open position wherein the firearm is positioned with the trigger guard stud projecting through the trigger guard, to a closed position where the movable plate is positioned substantially parallel to the fixed plate and at least a portion of the receiver of the firearm is held in a compressive grip between the grip pads. A lock selectively restricts operation of the shifting means and the movable plate.