The purpose of this study was to the authority of the provincial government in the management of coastal sea areas, and the authority of regency/city governments in the management of coastal sea areas. This type of research is normative legal research, using a conceptual approach and a statute approach. The legal materials used in this study consist of primary, secondary and tertiary legal materials. The legal material that has been described in accordance with the main problem is then distributed, explored and then given an argument so that the whole forms a logically interconnected whole about the disclosure of logical rationale and the ontological basis for the issuance of laws governing coastal marine areas. The results of this study indicate that the regulation of management of marine resources is still centralized so that there are many conflicts with the authority of the Regional Government. The promulgation of Law 23 Year 2014 concerning Regional Government whose authority to manage sea areas is the Provincial Region. This article has aborted Article 18 paragraph (1) of Law 32 Year 2004 which states that Regions that have sea territories are given the authority to process resources in their sea territories. The impact of local governments is the difficulty to guarantee the welfare and/or prosperity of the people in this case the people in the sea area which lead to injustice in realizing the people's constitutional rights.