The Japan Federation of Medical Workers' Unions (Japanese: 日本医療労働組合連合会, Nihon Iroren) is a trade union representing workers in the healthcare sector in Japan.
The union was founded on 31 August 1957,[1] and affiliated with the General Council of Trade Unions of Japan (Sohyo).
[2] By 1970, it had 65,646 members, rising to 144,161 in 1985.
[2] In 1989, Sohyo merged into the new Japanese Trade Union Confederation, but Nihon Iroren instead opted to join the new National Confederation of Trade Unions (Zenroren).
[2] By 2019, it was Zenroren's largest affiliate, with 154,379 members.