1640s in Japan

empress of Japan (1624-1696)

emperor of Japan (1633–1654)

was a after Genna and before Shōhō. This period spanned the years from February 1624 through December 1644. The reigning emperors and single empress were , and .

thumb | right | Emperor Go-Kōmyō

was a after ''Kan'ei and before Keian''. This period spanned the years from December 1644 through February 1648. The reigning emperor was .