The Constitutional Court has handed down the decision No. 46/PUU-VIII/2010 which brings a new paradigm in the family law system in Indonesia. Acceptance of judicial review of Article 2 paragraph (2) and Article 43 of Law no. 1 of 1974 concerning Marriage resulted in a decision stating that a child out of wedlock not only has a civil relationship with the mother and her mother's family, but also with her biological father as long as it can be proven by science and technology. The decision amends Article 43 paragraph 1 of Law no. 1 of 1974 concerning Marriage and reaped a lot of controversy. Most of the community stated that the decision legalized adultery. Therefore, the author raises the issue of the implications of the decision of the Constitutional Court no. 46/PUU-VIII/2010 on marriage law in Indonesia. The results of the discussion show that the decision has no effect on the provisions for registration of marriages as regulated in Article 2 paragraph (2) of Law no. 1 of 1974 concerning Marriage. However, it has big implications for the position of children born out of wedlock. Children born out of wedlock have the same rights as legitimate children, namely having kinship relations with biological fathers, maintenance, marriage guardians, and inheritance. The type of research used is library research using normative-juridical and juridical-sociological approaches. Sources of data were extracted from written materials such as legal texts such as law books, statutory regulations, compilations of Islamic law and journals relevant to the problems the authors discussed.