Abstract: A computer interface card mounting device is incorporated in a computer casing of a notebook computer. The computer casing has a first side wall, a second side wall opposite to the first side wall, and a diskette receiving opening formed on the first side wall. The mounting device has an elongated loop flange extending inward from the second side wall, directly opposite to the diskette receiving opening, and having one side with a threaded opening. The computer interface card has a mounting panel, one end of which is to be mounted on the flange at the threaded opening. The second side wall has a longitudinally extending elongated opening surrounded by the flange for accessing electrical connectors provided on the mounting panel.