This paper will show what the condition of workers' houses in the suburbs of Osaka were like by examining the work of Juntaro Yamaoka. He made various contributions to the business world in Kansai. When he became the eighth president of Osaka Chamber of Commerce and Industry in 1917, he established Osaka Jutaku Keiei Co. Ltd., which was responsible for housing development in and around Osaka City. Senriyama Estate and Tanabe-cho Estate were developed by 0. J. K. Co. Ltd. He could succeed in building the Japanese Garden City at Senriyama. But O. J. K. Co. Ltd. did not continue housing management, because of business crisis. As a result, it was dissolved in 1928.
