The visa card replaced many instruments of commercial dealings and transactions because it is characterized by flexibility in use, and it is envisaged that it would achieve a lot of gains and advantages to the Sultanate if produced and handled in scientific carefully studied style. This study focused on considering the visa card legal system, and the study also covered the following issues: • The historical development of money and how gradually progressed till it became probable to buy items and services through a plastic card that is easy to carry, providing holder with abundant services and many facilities. • Study the contract of visa card and its legal status, in that a conclusion was reached that the visa card has a special criterion provided by the trade and commercial environment and developed by modern technology. Resultant relations between card handlers and the effects of its use represented by exchanged obligations between card issuer and the client from one side, and the exchanged obligations between the issuer and the tradesmen on the other hand, also between the clients and the tradesmen on the third side, The study considered the difference between the visa card and other types of payment settlements, thus we tackled the issue of promissory notes and checks denoting similarities and dissimilarities between them and the visa card. We ended up in contentment that visa card is better than the promissory notes and checks through many advantages. . In this study an explanation was made towards the civil obligations and responsibilities regarding the use of card for each of the issuer, client and tradesmen in addition to the responsibility against others, together with the punitive responsibility for the card holder, the dealer and others. • The study ended with a conclusion and the most significant results maintained together with recommendations. Due to the importance of visa card, it is important to carry out an analytical study to know all related dimensions and legal aspects, in consideration to the pressing need for it in this era; therefore there is a necessity to deeply study this card system, consequences and the responsibilities of those who deal with it.