The purpose of this research is to discover the regulation towards auction of mortgage rights in civil and agrarian law in Indonesia. Also the validity of imposition mortgage right which turns out to be a shared assets that have been done without the approval of former wife. This research also evaluate judges consideration in deciding the case regarding the auction of the land which become the object of dispute in verdict number 222 K/Pdt/2017. This research uses normative law with descriptive data approach. The data type that used in this research is secondary data, a data that is not obtained directly from the field or society but through literature study by reviewing a book, literature, journal and internet data. The research approach that used in this thesis is an approach towards law systematic, a research that done to a specific legislation or a registered law. the data collection type that used is literature study, while the analysis technique done by qualitative. the results from this research is that the law protection for those object auction buyer, which object turns out to be a mortgage right of credit agreements where the land that imposed by mortgage right are shared assets that are executed afterwards. but when the imposition are not through an agreement from former wife, which analyzed according to the law number 4 year 1996 (UUHT) aswell as the regulation ministry of finance no. 93/PMK.06/2010. where the mortgage rights holder have the right to execute mortgage right based on their own power, based on article 6 UUHT. There are many regulations that support the auction buyers with good intention should be protected and the judges reasons for prioritizing legal protection for auction buyers that will be discussed in this thesis.