He graduated from Waseda University. While at Hiroshima First Middle School he was champion in shot-put and discus throw. At Waseda University he was captain of the track team.
Yoshio Okita competed in the hammer and discus throw at the 1928 Summer Olympics and placed 15th and 30th, respectively. He also attended the 1932 and 1936 Olympics as a field coach for the Japanese athletics team. In 1993 Okita took part in the World Masters Athletics Championships. Being the sole hammer throw competitor in the over 90 years age group he won the event with a result of 12.1 m.