Fastening device

A fastening device for securing and protecting an electronic device, the electronic device being provided with at least one assembly hole, and the fastening device comprising:

• a fastening assembly, the fastening assembly comprising:
• a buffer;
• and
• a fastening element inserted through the buffer, the fastening element including a rod portion, a fastening portion at one end of the rod portion, and a head portion at the other end of the rod portion, wherein the fastening portion is fastenable in the assembly hole;
• a plate, including a first positioning hole and a second positioning hole communicating with the first positioning hole, wherein a diameter of the first positioning hole is greater than a diameter of the second positioning hole, and a diameter of the head portion is less than the diameter of the first positioning hole and greater than the diameter of the second positioning hole, so that the head portion is engaged with the second positioning hole, and the electronic device is secured over the plate,
• wherein the plate further includes a first surface, a second surface opposite to the first surface, and an extension hole passing through the first surface and the second surface, wherein a first direction is between the first positioning hole and the second positioning hole, and the extension hole is formed along the first direction and between the first positioning hole and the second positioning hole;
• and
• two pillar-shaped protruding portions protruding from the second surface and disposed at two sides of the extension hole, respectively, the buffer being in contact against the first surface, the head portion and the two pillar-shaped protruding portions being disposed correspondingly so as to prevent removal of the head portion from the second positioning hole.