The decision to maintain the policy was unanimous, the Bank of Japan said.
The bank also stuck with its estimate of the economic situation, saying that the economy was improving moderately.
In April, the bank decided to introduce aggressive monetary easing steps to achieve 2-per-cent inflation within about two years in a country which has been plagued by 15 years of deflation.
The bank has been buying government bonds and riskier financial instruments to support this.//DPA