(Yi Hai twelfth lunar month twenty), January 19, 1960, both Japan and the U.S. "Japan-US co-operation and Security Treaty."

also known as "the new Japan-US Security Treaty. Festival Director-General of Japan and the United States following the Japan-US Security Treaty, a treaty of alliance. January 19, 1960, both Japan and the United States signed in Washington on the "Japan-US Mutual Cooperation and Security Treaty entered into force on June 23. the treaty 10
main content: the United States continue to have the right to a military presence in Japan, and the use of military bases; Japan and the United States will be "effective self-help and mutual aid," to maintain and develop their resistance to armed the ability to attack; in the Japanese territory the previous day of any party in the United States suffer from armed attack, the two sides will take action to meet the common danger "; treaty is valid for 10 years. The treaty expires June 23, 1970, Eisaku Sato Cabinet notify the U.S. government announced that it is automatically extended the validity of the treaty.