„ This paper primarily provides a deeper insight into the regulation of voidable legal affairs of the Croatian legal system with a comparative overview of the development of appropriate institutes in comparative law. First of all, we explain the position of voidable legal affairs in the context of invalid legal affairs as it was in Roman law until the current positive legal system. As can be seen by reading this paper, our legal system has decided to regulate the institute of voidability in terms of relative voidness as understood in general legal theory. We gradually go through the reasons for voidable legal affairs and give a summary of how specific reasons are interpreted in comparative law. It seems that our legislator has composed each part of this institute from parts of different legal systems, and we do not find such an identical regulation of voidable legal affairs in comparative law. However, in practical application it proves to be relatively effective and new changes in this area are not visible. In the end, although the institute of voidable legal affairs in our legal system has strong consequences as well as void legal affairs, the decision on the fate of a legal affair always depends on the parties themselves who enter into the legal affair.“