The Koreans in Japan who immigrated before and during World War II have suffered from various kinds of discrimination. Aged Koreans are especially disadvantage because of insufficient social welfare available to them. The purpose of this paper is examine the actual conditions of aged Koreans (55 years old and over), in terms of their employment and occupational status. Ota-ku, located in the southern fringe of Tokyo, was chosen for the author's field survey because a number of Koreans live and work in smallscale metal and machinery factories concentrated there. First, the author made an overview of Korean immigration history in Japan and the features of their employment before and after World War II. Before the War, millions of Koreans immigrated to Japan were mainly farmers who faced difficulties under Japanese colonialism. They could do little but move to Japan due to poor employment opportunities in their home country. During World War II, many Koreans were forcibly brought to Japan by the Japanese colonial government to meet labour shortages in the Japanese mainland. These Koreans were compelled to work as manual laboures at mines, munitions factories, and harbor facilities until the end of the war. After the war, under violent hardship about 500,000 Koreans remained in Japan for various reasons. Secondly, the author examined the present situations in employment of the aged Koreans living in Ota-ku, Tokyo, compared to Japanese. Data used in the paper was collected from the Ota branch of Mindan (Korean Residents Union in Japan) as well as the Ota Public Employment Security Office. The characteristics in employment of the aged Koreans were examined in terms of their occupational structure and school careers. As for their occupation, the majority of the aged Koreans in the area are either self-employed or manual laborers, mainly working in metal and machinery factories which are typical industries in this area. Most of the self-employed are in sales positions mainly comprised of managers of Korean restaurants and sellers of used metal or machine parts. On the other hand, white-collar jobs have not been fully accessible to Koreans, even if they are highly educated. It should be pointed out that the job opportunities for Koreans are often not related to their schooling, because of the ethnically discriminated labour market in Japan. Few of them have qualifications enough to receive social security pension, which compells Koreans to continue working even if their health is in question. But the older they are, the harder it is to find suitable jobs. The author made interviews with some aged Koreans to know their personal life histories. Their life histories not only illustrate vividly their struggle for getting employment, but also shows their status as a minority in Japanese society which has not accepted or integrated them. National pension is not virtually given to aged Koreans, although the law has been revised several times. It should be the task for the Japanese Government as well as the Japanese society to do away with such discriminative treatment concerning the Koreans in Japan.