The 2004 AIG Japan Open Tennis Championships was a WTA hard court tennis tournament for women in Tokyo . It was part of the 2004 WTA Tour as a Tier III category tournament . The tournament took place from October 2nd to October 10th, 2004.
Qualification for the AIG Japan Open Tennis Championships 2004 took place from October 2-4, 2004. Four qualifying places for the singles and one qualification place for the doubles were played, which entitle them to participate in the main draw of the tournament.