Dōjunkai ("shinjitai": , "kyūjitai": ) was a corporation set up a year after the 1923 Kantō earthquake to provide reinforced concrete (and thus earthquake- and fire-resistant) collective housing in the Tokyo area. Its formal name was "Zaidan-hōjin Dōjunkai" (), i.e. the Dōjunkai corporation. The suffix "kai" means organization, and "dōjun" was a term coined to suggest the spread of the nutritious benefit of the water of river and sea. It was overseen by the Home Ministry.