Obligations and contracts are amongst the most important legal topics in Iran’s statutory provisions, especially in private law domain. Since the objective of every contract is the enforcement of its content and requiring the parties to the effects resulting of them, the foundation of the contracts can be realized as the intentions and wills common between the parties.But, with the progress of the communities’ legal system and the daily increasing growth of the economical transactions and complication of the financial contracts, it is sometimes difficult to infer the common intention of the parties through investigating the contract text and discrepancies come about between them. In between, each party to the contract defines the common intention based on its own interests and a judge is finally required to resolve the hostility and interpret the contract. However, the judge’s scope of authorities should not be considered so vast that s/he can be allowed entering the interpretation contract unduly and unlawfully and bestow the contract a meaning other than what the contract parties have willed. In other words, the debates on the contract interpretation are envisaged necessary and essential where a flaw comes about in the contract content implementation as a result of which the effectiveness of the individual and social relationship between the parties suffers.