In this paper, the author deals with the largely unresearched and neglected problem of contracts on investment in the development of sport. Most attention is paid to the relevant law in these contracts, wherein the legal solution, which does not impose Croatian law as relevant, is critically presented. However, along with some other comments, the legal solution of the amendment to the Family Law Act is assessed as being poor. This, in the author’s opinion, as a consequence allows circumvention of the Croatian law. This paper is divided into fi ve sections and the most important one, the fourth section, is divided into subsections. In the conclusion, appropriate changes to the law are suggested according to the given arguments.