The Society was relaunched under its current name, Nippon Kaiji Kyokai(the Japan Marine Association), in 1946 in the aftermath of World War Two.
In 1952, after the Treaty of San Francisco went into effect, all the ship classification operations were back to normal and the NS* class notation was once again recognized internationally.From a state of near complete destruction, the Japanese Shipping and Shipbuilding industries recovered gradually and then grew rapidly in strength, with the Society called upon to survey a large number and wide range of different vessel types over the years. The Society's Register of Ships had reached 1 million tons by 1963, exceeding 10 million gross tons by 1966, and 100 million gross tons by the end of 1997. As of the end of May 2012, Nippon Kaiji Kyokai has more than 7,800 vessels totalling over 200 million gross tons under class.