A lease agreement is an appointed legal transaction arose from business and legal construction created with the aim of the efficient meeting the needs of participants in the transaction. The legal theory and practice set out the criteria for the division of leasing contracts, so this legal transaction got its basic characteristic features. That is the way of a creation of basic forms of leasing agreements. According to its characteristics, a lease agreement has a mixed legal nature. Depending on the type of a contract, it may have the characteristics of a contract of sale, tenancy agreement, loan agreement, etc. In certain types of leasing, some characteristics of one of the listed traditional contracts dominate in a weaker or stronger intensity. This paper deals with a theoretical analysis of the relationship of the leasing contract with the contract law agreements. A special emphasis is placed on the operating and financial leasing as two basic types of leasing contracts varying by their nature.