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| 1958, May 22 |
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| Prime Minister Kishi and his Liberal Democratic Party won in the national elections. | 1 |
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| 1960, Jan. 19 |
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| The U.S.-Japanese Treaty of Mutual Security was signed in Washington, D.C. | 2 |
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| June 16 |
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| Following three weeks of demonstrations opposed to the treaty, Prime Minister Kishi requested that Pres. Eisenhower postpone his scheduled visit to Japan. | 3 |
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| June 19 |
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| The U.S.-Japanese Treaty of Mutual Security was passed by the Japanese House of Representatives despite violent riots opposed to it. The treaty became effective on June 23. | 4 |
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| July 18 |
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| Ikeda Hayato (1899–1965) was elected prime minister. A pro-Western former minister of international trade and industry, Ikeda became Japan's ninth postwar prime minister. | 5 |
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