What was the formal name of the document signed to end Japan's war with the Allies in 1945?

The formal name of the document signed to end Japan's war with the Allies in 1945 was the Japanese Instrument of Surrender.

The instrument was signed on September 2, 1945, aboard USS Missouri in Tokyo Bay. It set out Japan's capitulation and confirmed acceptance of the conditions imposed by the Allied powers.

The document should not be confused with the Potsdam Declaration. The declaration, issued on July 26, 1945, demanded Japan's surrender and outlined Allied terms; the instrument was the later document that formally recorded Japan's acceptance.

Representatives of Japan and nine Allied governments signed the instrument. It took effect at approximately 9:25 a.m. Japan Standard Time, marking the formal end of hostilities between Japan and the Allies in World War II.