League promotion/relegation series matches on December 7 and 10.
Following eighteen clubs played in J.League Division 1 during 2005 season.
Eighteen clubs will play in double round-robin (home and away) format, a total of 34 games each.
The clubs are ranked by points, and tie breakers are, in the following order: A draw would be conducted, if necessary.
League Division 1Notes:† Team played previous season in J2.‡ Relocated from Ichihara to Chiba.