The Aussie dollar has been steadily climbing against the yen since October 31, when the Bank of Japan unexpectedly announced it would increase its massive bond-buying program in a bid to kickstart its sluggish economy.
The BoJ said it had ramped up its bond-buying program by as much as 20 trillion yen ($A196.92 billion) a year, to 80 trillion yen.
On Wednesday morning, the Australian dollar reached 100.48 yen - its highest level since May 22.
It's one of the few times since the early 1990s that the local currency has passed the 100 yen milestone.
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