Electronic device and engaging structure thereof

An engaging structure comprising:

• a first engaging element comprising a plate portion and a plurality of hooks located on the plate portion, each hook having an end;
• and
• a second engaging element comprising a first side portion, a second side portion, an engaging portion between the first side portion and the second side portion, a first rib and a second rib, the engaging portion comprising a plurality of recesses engaged with the hooks, each of the recesses having a front edge, the first rib located on the first side portion and the second rib located on the second side portion, when the first engaging element is engaged with the second engaging element, a first gap is formed between the end of the hook and the front edge of the recess, the plate portion being disposed on the first rib and second rib, wherein the hook is detachable from the recess based on the exist of the first gap.