Abstract: A fastening mechanism for detachable keyboard modules with the keyboard module consists of at least one fastening seat. The fastening seat engages with a fastening means. The keyboard module is fastened to a computer casing through the fastening means. The fastening means includes a body, two slide channels and an elastic element. The body has a second fastener located at a front end and a housing chamber located at a rear end. The two slide-channels are located at two sides of the body to form a slidable coupling with two slides which located at two sides of the fastening seat. The elastic element is restricted between the housing chamber and a stopping flange which located at a rear end of the fastening seat. The elastic force of the elastic element may push the fastening means forwards to enable a second fastener located at the front end of the body to engage with a first fastener located at the computer casing thereby to enable the keyboard module fastening to the computer casing.