J1리그 18개 팀 가운데 매시즌 17∼18위가 자동으로 2부리그 강등되고, J2리그 1∼2위가 1부리그로 승격된다.
Among the 18 teams in the J1 League, 17th to 18th place are automatically demoted to the second division every season, and the first and second places in the J2 league are promoted to the first division.