On December 25, 1958, when Kamata was a Chuo University student, he debuted for Japan national team against Hong Kong. He played at 1964 Summer Olympics in Tokyo and 1968 Summer Olympics in Mexico City. He played in all match at both tournament and Japan won Bronze Medal in 1968. In 2018, this team was selected Japan Football Hall of Fame. He also played at 1962 Asian Games. He played 44 games and scored 2 goals for Japan until 1958.