Maritime trade law is an important field with a long history. However, it is possible to express maritime trade as a sector that encounters the most problems. It is clear that this area, which can be considered as ships with a much heavier load carrying capacity than land and air transport vehicles in freight transport, transportation centres, and any place with a port, should be the common problem of all countries trading by sea. For this reason, it is clear that the commercial mechanism by sea should be considered and evaluated together with all its elements. While international trade rules constitute one of the important elements of maritime trade law, the responsibilities of the port and flag state are regulated by both international treaties and domestic regulations. In particular, multilateral international agreements and the standards determined are important in terms of ensuring that maritime trade is carried out in a healthy manner and that problems are resolved in accordance with equity. The Maritime Labour Convention, referred to as Maritime Labour Convention 2006, is one of the important regulations in recent years. In our study, both this convention, other international conventions and "port state responsibility" in our domestic legislation are briefly explained. It is important to note that the main purpose of the path leading to port state responsibility is, of course, the realisation of maritime trade with ships that are suitable for this purpose, and that the ports visited in maritime transport, other than the flag state, also undertake various duties and that maritime trade as a whole is legally secured. While explaining the powers and responsibilities of the port state in terms of both international conventions and our domestic legislation, many researches and surveys have also been utilized.