A bill of Exchange was originally used as payment instrument. Recently, it is mostly used as securing instrument. This purpose was mainly evolved by legal practice and its legislation could be problematic and unclear for laymen. The main aim of this thesis is to analyze a bill of exchange as a securing instrument. Further attention is paid to the function of payment. However, the bill of exchange and check are both regulated in identical law, so to some of its institutes I also describe a checks. The main attention of my thesis is devoted to the securing purpose of the bill of exchange. There I describe the specifics of this instrument in the comparison of other civil securing instruments. Due to this contrast, it can be said, that the bill of exchange gives the creditor some significant advantage on one hand, but finds some insuperable limits on the other hand. My thesis is divided into five chapters. The first chapter describes the historical development of bills of exchange and check, and the circumstances under which these institutions were created. The second chapter deals with the exchange and check law, their rules, the systematic inclusion of this branch of law and the basic peculiarities are defined. The third chapter is devoted to a general definition of the bill of exchange, describes...