He finished second in the 1960 Olympic bantamweight class and then won gold medals at the 1964 and 1968 Olympic Games as a featherweight. He participated again in the Games in Munich in 1972, finishing 4th in the featherweight class. He also won world championships in 1962, 1963, and 1965-66.
Miyake set 25 world records, including 10 consecutive records in the snatch and nine consecutive overall records in the 60kg class. Miyake later became Japanese national weightlifting coach. His brother, Yoshiyuki Miyake, also a weightlifter, won the bronze medal in the 1968 Olympic featherweight class and won world championship in 1969 and 1971.