Protection structure applied to a hand-held electronic device

A protection structure applied to a hand-held electronic device, the hand-held electronic device has a front surface, a rear surface opposite to the front surface, a surrounding peripheral surface disposed between the front surface and the rear surface, a front surrounding edge connected between the front surface and the surrounding peripheral surface, and a rear surrounding edge connected between the rear surface and the surrounding peripheral surface, wherein the protection structure comprises:

• a protection unit including at least one first protection frame corresponding to the front surrounding edge of the hand-held electronic device and at least one second protection frame corresponding to the rear surrounding edge of the hand-held electronic device, wherein the hand-held electronic device is placed between the at least one first protection frame and the at least one second protection frame, the at least one first protection frame has at least two first upper retaining structures, and the at least one second protection frame has at least two second upper retaining structures respectively corresponding to the at least two first upper retaining structures;
• and
• a connection unit including at least one connection element slidably disposed between the at least one first protection frame and the at least one second protection frame, wherein the at least one first protection frame and the at least one second protection frame are respectively positioned on the front surrounding edge and the rear surrounding edge of the hand-held electronic device through the at least one connection element, and the at least one connection element has at least two first front retaining structures respectively retainingly mated with the at least two first upper retaining structures and at least two first rear retaining structures respectively retainingly mated with the at least two second upper retaining structures.