Visa
All foreign visitors entering Japan must have a valid passport. Delegates from countries requiring a visa should apply to the Japanese consular office or diplomatic mission in their country prior to departure. For details, participants should contact their local travel agents or consular offices.
The web-site of the Ministry of Foreign Affairs of Japan provides information on who will require a visa to enter Japan.
http://www.mofa.go.jp/j_info/visit/visa/