Prime Minister's Cup
Japanese title 1957-1981, restricted entry (middle-ranked pros). Named for Hatoyama Ichiro.
Winners:
1957 Fujisawa Hideyuki
1958 Okubo Ichigen
1959 Hasegawa Akira
1960 Ohira Shuzo
1961 Kano Yoshinori
1962 Hayashi Yutaro
1963 Sakakibara Shoji
1964 Miwa Yoshiro
1965 Otake Hideo
1966 Hoshino Toshi
1967 Suzuki Goro
1968 Ishida Yoshio
1969 Takagi Shoichi
1970 Kojima Takaho
1971 Takemiya Masaki
1972 Kobayashi Koichi
1973 Takemiya Masaki
1974 Kobayashi Koichi
1975 Takagi Shoichi
1976 Kobayashi Koichi
1977 Awaji Shuzo
1978 Nakamura Hidehito
1979 Haruyama Isamu
1980 Fukui Masaaki
1981 Awaji Shuzo