Kuroda, by contrast, has consistently maintained that the BOJ's priority is to hit the price goal and that the deadline is key to eradicating what he calls the public's "deflationary mindset".
With the government of Prime Minister Shinzo Abe also appearing more relaxed about inflation, the BOJ chief, already presiding over a split board, is in danger of finding himself isolated.
In recent days, advisers Koichi Hamada and Etsuro Honda, who counselled Abe on the need for radical easing, have told Reuters that the BOJ could cut its inflation target and that cheaper crude did not require further action.
Harada's views suggest he is among those who are more relaxed about the timeframe for hitting the target, said Hideo Kumano, chief economist at Dai-ichi Life Research Institute.
"Many on the board aren't willing to ease again soon and, more importantly, there's no government pressure for action," he said. "Taken together, near-term action seems off the table."
Harada's predecessor Miyao, who steps down on March 25, swung the board in favor of last October's surprise 5-4 decision to expand the bank's huge purchases of government bonds and other assets.
Since then, the board has been divided between Kuroda and his two deputies, who are adamant about hitting the price target, and the six other members who are cautious of acting again just to accelerate inflation.
Many market players expect the BOJ will ease again sometime this year, with some predicting action as early as April, when the BOJ issues new long-term price forecasts.
But analysts say those who think an early move is made more likely by the newcomer could be in for a surprise this month, when Harada, whose nomination has been approved by both houses of parliament, holds an inaugural news conference.