Fastening mechanism for package device

A fastening mechanism for a package device, the fastening mechanism, comprising:

• a plurality of first protrusions stagger-arranged in two rows at a coupling edge of a lid of the package device, wherein a gap is formed between the two rows of the first protrusions, and the coupling edge of the lid is to be coupled to a corresponding coupling edge of a body of the package device for fastening the package device;
• at least a second protrusion formed on the coupling edge of the body and corresponding in position to the gap between the first protrusions;
• at least a projection formed on the coupling edge of the body and substantially opposed in position to the second protrusion;
• and
• at least a recess formed on the coupling edge of the lid and substantially opposed in position to the first protrusions, wherein the recess corresponds in position to the projection of the body;
• wherein by coupling the lid to the body, the second protrusion of the body is engaged with the gap formed between the first protrusions of the lid, and the projection of the body is engaged with the recess formed on the lid, so as to provide strong fastening effect for the package device.