The aim of the paper is to present and distinguish different kinds of legal securities used in leasing agreements in Poland. Basing on dogmatic research the author juxtaposes information on leasing agreement and explains a form of securities used in practice when concluding leasing agreements and potential threats which results from the failure to repay their liabilities by leaseholders.The considerations included in the paper concentrate on presenting a leasing agreement in the Polish civil law. The author also explains the aspects of legal security of leasing agreements in economic turnover , presents the origin and evolution of leasing agreements in the world and in Poland. In addition he describes leasing agreements as a modern agreement in economic and legal turnovers, legal securities used in concluding leasing agreements and present dissolutions of legal relationship of leasing. Explaining the origin of leasing both in the world and in Poland , the author presents advantages and disadvantages of different kinds of legal security used by leasing companies in concluding leasing agreements and ways of terminating them in accordance with legal provisions.