In 1946, after the end of World War II in Japan, the Japanese government established a committee to receive and distribute food, clothing, and others items received by the Licensed Agencies for Relief in Asia (LARA), an initiative of American welfare organisations.
[5][6] The Catholic Church of Japan was one of many Christian initiatives that partnered with public authorities to distributing relief items[7] and part of this committee.
[8] Two years later, in response to a letter by the Holy See on the coordination of the Catholic social programmes, the Japanese bishops decided to register the Caritas Society of Japan as an incorporate association.
In each diocese, a priest was appointed to be in charge of the social services provided.
[9] In 2023, Caritas Japan funded the humanitarian relief efforts of the other members of the Caritas Internationalis confederation aronund the globe, including in South Sudan, Ukraine, Pakistan, Madagascar, Venezuela and Morocco, as well as development efforts abroad and activities implemented in Japan.