The All-Japan Seamen's Union (JSU; Japanese: 全日本海員組合, Kaiin) is a trade union representing seafarers and harbour workers in the marine industry, in Japan.
[1] It was a founding affiliate of the National Trade Union Council, but as that federation moved to the left, it quit and formed the All-Japan Trade Union Congress.
[2] From 1960, it supported the Democratic Socialist Party, but dropped this in 1973.
[3] In 1964, the union was a founding affiliate of the Japanese Confederation of Labour, and by 1967 it had 142,935 members.
[2] It is now affiliated to the Japanese Trade Union Confederation, and as of 2010 had around 76,000 members, the majority of whom are not Japanese citizens.