The dollar topped the 100-yen mark on Thursday as the greenback won support from growing expectations of strong US jobs data while the Bank of Japan issued an upbeat assessment of the world's third-largest economy.
The greenback fetched 100.07 yen against 99.74 yen in New York Wednesday afternoon, climbing above the psychologically important mark for the first time since late July.
The euro also strengthened against the Japanese unit at 131.84 yen from 131.70 yen, while it slipped to $1.3172 from $1.3204.
Expectations are growing that the US will see strong payrolls data this week, which could seal the deal for the Federal Reserve to start tapering its massive bond purchases later this month, a move likely to boost US bond yields and the dollar.
The Japanese central bank's board on Thursday voted unanimously to hold off expanding its own massive monetary easing programme as it wrapped up a two-day policy meeting, saying in a statement that the "economy is recovering moderately".
The statement marked a step-up from last month, when it said the economy was "starting" to recover, but the bank's decision to stand pat on its asset-buying programme was widely expected.
"The impact of the BoJ statement on the market was limited as the wording was within a range of our expectations," said Yosuke Hosokawa, head of FX sales team with Sumitomo Mitsui Trust Bank.
BoJ Governor Haruhiko Kuroda told reporters Thursday that the bank would take "necessary measures" if a planned sales tax hike curtailed Tokyo's bid to stoke growth and meet a two-percent inflation target.