On December 16, 2015, Japan`s Supreme Court handed down a notable judgement. Supreme Court stated that while the first one hundred days of the six-month moratorium on remarriage were not in violation of the Constitution, the portion of the moratorium in excess of one hundred days was a violation of the constitution. Some Civil Law scholars have criticized this judgement, giving precedence to the freedom of marriage and claiming that the remarriage moratorium is unconstitutional in its entirety. I also believe that in future it will be appropriate to completely abolish the remarriage moratorium. However it is not adequate to discuss such matters solely from the perspectives of human rights and gender equality, and moreover entail difficult questions about the significance of other institutions established in the Civil Code such as the system for the presumption of legitimacy. Under the current Civil Code, the remarriage moratorium has in practice become a means of maintaining and rendering more effective the system for the presumption of legitimacy, and that the freedom to remarry is structured in such a way as to be unavoidably restricted by this system. In this paper, after ascertaining the state of the conventional debate surrounding the remarriage moratorium for women, I introduce the Case of the Remarriage Moratorium. Finally, I discuss the evaluation of this Judgement as well as some future challenges. I propose a revision that encompasses not only marriage law but also filiation law.