This article examines the Japan–U.S. cooperation in the Intermediate range Nuclear Forces (INF) reduction negotiation. The first section considers the perception of Japanese Government to INF problem. In March 1983, President Reagan tried to agree to the movement of SS-20 that Secretary-General Andropov had proposed. Andropov was going to reduce SS-20 in front of Europe, and to move this to Siberia. It meant the threat to Japan of SS-20 increased. In May 1983, Prime Minister Nakasone insisted on global zero of the INF in the Williamsburg summit. And, he supported NATO's Pershing II deployment. In addition, he stressed that the security of Japan–U.S.–Euro was inseparability. The purpose of Nakasone's speech was to have discontinued the movement of SS-20 of the Soviet Union. The Soviet Union was not able to oppose the unity of G7 and abandoned the movement of SS-20. However, a more concrete settlement plan was necessary to remove SS-20 that had already been deployed from the Asia part.
The second section explores a Japanese concrete reduction plan of SS-20 in the Asia part. In February 1986, Reagan informed Nakasone of INF reduction plan in the letter. Reagan was going to abolish SS-20 in the Europe part at the first stage. Moreover, Reagan described for it to reduce SS-20 in the Asia part by 50% at the first stage, and to aim at the further reduction at the second stage. The Japanese Ministry of Foreign Affairs prepared the alternative proposal for Reagan. The alternative proposal was warned of that Reagan's plan caused the reduction negotiation between Asia part SS-20 and the U.S. forward-deployed force. That is, it meant danger of ruining the basis of the Japan–U.S. alliance. Reagan accepted the Nakasone's alternative proposal and promised Asia part SS-20 abolition.
The third section discusses the background to which Nakasone supported INF deployment in Alaska. In June 1987, Western European leaders controverted the problem of denuclearization in Europe. In the Venice summit, Nakasone demanded the re-unity on the western countries to oppose the Soviet Union. And, he supported the deployment of INF with U.S. mainland. Nakasone understood INF of U.S. mainland did the balance to Asia part SS-20. These Nakasone's insistence promoted the re-unity on the western countries. The Secretary-General Gorbachev was confronted with the re-unity on the western countries and the potential pressures of Chinese Government. Consequently, he decided abolition of SS-20.
A final section reexamines the cooperation of Japan–U.S. in the nuclear disarmament. INF reduction plan of Japan contributed to the achievement of INF abolition. However, it controlled a real discussion in Japan concerning the extended deterrence of the United States.

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