After attending Shijonaga High School, Miyaji headed to
Doshisha University. In his university enrollment days, he joined at the second Japanese Association invited NHK Cup along with
Yoshihiro Sakata and other players, winning against
Kintetsu and virtually took part in rugby. Later, he got work in
Sanyo Tokyo. Also, he took part in the
Japan national rugby union team, with which he participated in the Asian championship in 1969, during the match against
Hong Kong and won 1 cap. After his retirement, he became the coach of
Japan twice in 1978 and 1984. And after the resignation of his predecessor
Hitoshi Oka, he took the lead for the third time as head coach for the Japan national team in the
1987 Rugby World Cup, taking the command during the tournament. Then, he took over as coach for
Sanyo. Every year in the same period, he fought a nomination against
Kobe Steel, which won most in Japan at that time. However, at Sanyo Electric (currently,
Panasonic Wild Knights), through the players ad the coaching period, as he was not able to achieve the victory in the National Company Championship, he was known as . He ran a landscaping business, as well, he worked on the development of
Panasonic Wild Knights' training ground.
Nobuhiro Baba, the original author of the TV dorama
School☆Wars is a junior student in Shijonaga High School and has been providing a large number of rugby-related materials for writing his work. ==Death==