Through authentic act which clearly specify the rights and obligations, ensure legal certainty, and at the same time is also expected to avoid disputes. In the process of settlement of the dispute, which is the authentic deeds written evidence gives the strongest and most tangible contribution to the settlement cheaply and quickly. In a juridical sense, evidence is only necessary in a case upfront Court, both civil and criminal cases, therefore, when there is no dispute, then such evidence is not necessary. In this study the authors will address issues, how the responsibility of the notary as Public Officials of the notarial deed as evidence held to be invalid or flawed law? Where the purpose of this research is to know how responsibilities of a notary as Public Officials of the notarial deed as evidence held to be invalid or flawed. In writing this study, used normative juridical approach, which put emphasis to the research literature that describes secondary data, primary legal materials in the form of legislation, secondary legal materials such as books and scientific papers written by legal experts and related to the topic research and tertiary legal materials in the form of Indonesian Dictionary and Dictionary of law. The scope of this research is on issues relating strength of evidence deed, function and role. This study aims to investigate, discuss, describe and present issues related to the strength of evidence notarial deed.