The dollar bought 78.47 yen in morning trade, little changed from late Wednesday in New York, where it stood at 78.51 yen.
The euro bought $1.2913 and 101.33 yen in Asian trade, compared with $1.2903 and 101.31 yen in New York.
The dollar was well supported in the short term, because of increased risk appetite, said Osamu Takashima, Citibank Japan chief currency strategist.
The greenback has risen against the yen over the past few days, but there is little in the way of economic fundamentals to back that up, he said.
"The dollar likely won't rise above a mid-term important technical point," he said, noting 78.90 as the resistance.
Masafumi Yamamoto, Barclays Bank chief currency strategist, said position adjustments while the Bank of Japan's two-day policy meeting continues might create a bit of movement.
The BoJ was unlikely to offer anything new on Friday, but might announce more easing somewhere down the road, he told Dow Jones Newswires.