SEALING MECHANISM AND KEY DEVICE

A sealing mechanism which is suitable for a key device. The key device contains a key base (32), and the sealing mechanism (34) contains one front ring shell (44), one lamp base shell (46) and one sealing member (48). The front ring shell (44) is installed on the key base (32), and the lamp base shell (46) is installed on the front ring shell (44). The sealing member (48) contains a sealing body (50) and a sealing wall (52), wherein the sealing wall (52) is circularly arranged around the sealing body (50) so as to be fixed on the lamp base shell (46). When the lamp base shell (46) is installed on the front ring shell (44), the lamp base shell and the front ring shell (44) respectively push the periphery of the sealing body (50), so that the sealing body (50) and the front ring shell (44) jointly form one sealing space so as to seal one first open groove (321) on the key base (32). A key device which has the sealing mechanism. The sealing mechanism can effectively block foreign matter from entering the interior of the key device.