2012 International Congress of Odonatology. Odawara, Japan. 2012
Congress Information / Driving in Japan
Driving in Japan
*You can easily drive rental cars if you carry with you your driving license and an international driving permit (based on the Convention Relative to Road Traffic signed at Geneva in 1949) issued in your country before you leave your country for Japan. In the case of Belgium, France, Germany, Italy, Switzerland and Taiwan nationals an official translation of your home country's driver's license is required instead of international driving permit.
Please research it in the following sites and some other relevant sites that you may be find by Google, etc.:

Japan-guide.com -- Driving a car:
http://www.japan-guide.com/e/e2022.html
International Drivers License Information on idlicense.com
Renting a car in Japan
http://idlicense.com/IDLNews/?tag=/japan
Valid International Driving Permit in Japan
http://www.keishicho.metro.tokyo.jp/foreign/traffic/geneva.htm
Where to get International Driving Permits
http://www.drivers.com/article/207/