Maritime security is one of important aspects in the state defence system. Because of the wide range of responsibility by the elements of government, therefore abundant of resources is deployed to handle the task in order to contribute a maximum support to the effort in strengthening the state defence. This paper analysed the position of maritime security in the state defence system, so it can produce a significant contribution and also can work cooperatively with other government elements involved in the maritime environment. After a comprehensive analysis in the framework of defence system, it is found that maritime security has a unique position because it is a part of military component as well as non-military component of the state defence system. It also plays a strategic role in improving the people's prosperity as well as in guarding the state sovereignty.