The firms hit by the move were Bank of Tokyo-Mitsubishi UFJ, Mitsubishi UFJ Trust and Banking and Sumitomo Mitsui Banking, as well as regional lenders Shizuoka Bank and Chugoku Bank.
Moody's said it cut their rating by one notch to A1 with a stable outlook from Aa3, a day after cutting Japan's rating.
"The downgrade actions follow and are in response to Moody's downgrade of the Government of Japan's rating to A1 with a stable outlook from Aa3," it said in a statement.
"Despite these rating actions, Moody's considers that the willingness of the Japanese government to support major banks continues to be very high."
The cut to Japan's rating yesterday put it below neighbours China and South Korea, and on the same level as Israel and the Czech Republic.
The agency cited "rising uncertainty" over the country's fiscal situation- it has one of the world's heaviest national debt burdens- and Prime Minister Shinzo Abe's faltering efforts to kickstart growth, with an election just two weeks away.
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