The fishery infrastructures such as fishing port facilities are base of steady supply of marine products, have been maintained continuously and chiefly. Now, the finance of central or local government is very severe in Japan. It is necessary for public facilities administrator to perform both effective and strategic maintenance for prolonging lifetime and reduction of LCC (life cycle cost). In future, the maintenance and replacement of public facilities must be performed by preventive maintenance rather than breakdown maintenance. The deterioration countermeasures were evaluated, performed as main policy of "Basic plan for fisheries" and "Long-term plan for development of fishing ports and ground" by Fisheries Agency. "Basic plan for prolonging lifetime of public infrastructure" indicating the directionality of long-term maintenance was announced by Japanese government in November, 2013. "Action plan for prolonging lifetime of fisheries infrastructure" as medium-term and long-term action to execute steady maintenance was announced by Fisheries Agency in August, 2014. This paper will introduce outline of action plan.