45th Judan

The 45th Judan was held from May 11, 2006 to April 25, 2007. The current sponsor is Sankei Newspapers. The holder is Cho Chikun, and the challenger is Keigo Yamashita for the second time in a row. Hideki Komatsu, Norimoto Yoda, Kimio Yamada, Hideo Otake, Koichi Kobayashi, Kim Shushun, Naoki Hane, and Takeshi Sakai qualified through preliminary tournaments. The rest of the players were given spots automatically.