A wall hanger for hanging a display device on a wall includes a latching member, an outer hanger member, an inner hanger member and a screw. The inner hanger member includes a threaded portion with a threaded hole and a lock portion with a lock hole. The lock portion is integrally formed with the threaded portion and bent to face the threaded portion with a predetermined space therebetween so that the threaded hole and the lock hole are concentrically positioned. The screw has a predetermined length so that the inner and outer hanger members sandwich a rear cover of the display device when the rear cover of the display device is disposed therebetween. The lock hole prevents a long screw from being threaded into the display device by mating an inner peripheral face of the lock hole with a distal end of the long screw.