A trigger mechanism is provided for triggering an eject device of an electronic equipment with a front panel door. The eject device ejects a tray device, movably seated within the space of the electronic equipment, out of the electronic equipment when triggered. The trigger mechanism cooperates with the front panel door to trigger the eject device. The trigger mechanism works to trigger the eject device when a predetermined displacement of the front panel door form a normally closed position takes place. According to the invention, user can eject the tray device of the electronic equipment only by pressing the front panel door of the electronic equipment such that mistaken pressing of another functional button set on the front panel of the electronic equipment and possible cut of user's hand can be prevented. The trigger mechanism is composed of several simply mechanical components replacing a conventional trigger mechanism via a button such that manufacture cost of the electronic equipment can be reduced.