The topic of the thesis is the unfairness of the contractual provisions on the variable interest rate and currency clause in contracts on loans denominated in Swiss francs and loans denominated in Croatian kuna with a currency clause in Swiss francs. Namely, in the period from 2003 to 2008, the eight largest banks contracted controversial loan agreements on the Croatian market, introducing controversial provisions through the general terms and conditions. The described practice has led to a significant increase in the loan instalment, which has put many debtors in a difficult life and economic situation; Many in the process of forced execution even lost their family homes because it was often the so-called mortgage loans in which a lien has been agreed on the real estate of the borrower as collateral. This provoked a reaction from the public and led to the establishment of numerous associations, including the Franak Association, which is fighting for consumer protection and consequently starts the first collective procedure to protect consumer rights and interests in Croatian legal history, the Franak case. In the introductory part of this paper, the focus will be on the regulations governing Croatian credit agreement, and special emphasis is placed on EU directives with which numerous Croatian regulations on consumer protection are harmonized, which must be interpreted and applied in accordance with the provisions and objectives of the directives with which they comply. The central part will show the conduct of banks in each stage of the realization of the contract, from advertising, pre-contractual information, creditworthiness assessment to the information specified in the contract itself. The last part of the paper is dedicated to the analysis of court decisions made in the Frank case.