An adaptor device is provided for connecting and accessing data cards of various specifications and includes a data card insertion structure, a cover board, and a carrier board. The data card insertion structure forms at least one first insertion slot for the insertion of the carrier board. The carrier board forms at least one data card carrying section for carrying at least one selected data card. The cover board is mounted to a top surface of the data card insertion structure. An underside of the cover board is provided, at a predetermined position, with at least one set of signal contact elements. When the carrier board is inserted in the first insertion slot, a signal contact section of the data card is electrically connectable with the signal contact elements of the cover board for direct output through a signal connection port of the cover board or for output to a computer device via a signal connection port of the data card insertion structure.