The present invention discloses a metallic linkage-type keying device, which is installed to a casing, such as the casing of a camera, a mobile phone or a video camera. The metallic linkage-type keying device of the present invention comprises: a metallic linkage, having at least two joining portions; and at least one key, having at least two assembling portions. The key is installed to the metallic linkage via fixing two assembling portions to two joining portions. The metallic linkage-type keying device provided by the present invention can prevent ESD from attacking the interior of the casing via key gaps and has the advantages of compactness and low cost.