Career
Kubota is from Kawasaki, Kanagawa. He began judo at the age of a 2nd grader and after graduation from Kokushikan University, he belonged to Tokyo Metropolitan Police Department
He also participate Asian Games in 1998, but defeated by Kwak Ok-Chol from North of Korea
As of 2009, Kubota coaches judo at All-Japan national team and Tokyo Metropolitan Police Department.
