Tadashi Nakamura was born on February 22, 1942, in the town of Maoka on the island of Karafuto. Nakamura trained in various martial arts including Goju-Ryu, Kendo, and Kyokushin. In 1956 Tadashi Nakamura started studying with Mas Oyama and he had reached the rank of shodan(1st-degree black belt) on May 6, 1962.
When Tadashi Nakamura was 19 years old (1961) he made his first tournament appearance, the All-Japan Student Open Karate Championship, where he was placed first. In 1962, he took part in a match against a Muay Thai of the Lumpinee Boxing Stadium. The contest had been to determine which country had the ‘best’ martial art.