The dollar fetched 83.87 yen in Tokyo afternoon trade from 83.64 yen in New York Thursday afternoon.
The euro was at 109.74 yen from 109.38 yen, while rising to $1.3081 against $1.3073.
Japan's currency has come under pressure leading up to the December 16 polls, which are widely expected to see the ruling Democratic Party of Japan ousted by Shinzo Abe and his opposition Liberal Democratic Party.
Abe has repeatedly pledged to pressure Japan's central bank into launching more aggressive easing measures to kickstart the world's third-largest economy.
His successful re-election would boost the chances of Tokyo appointing a like-minded head of the central bank when current governor Masaaki Shirakawa's term ends next year, dealers say.
The forex market's focus was "completely on" Japan's election and the BoJ meeting, said a senior dealer at a major bank in Tokyo.
The BoJ's Tankan quarterly survey on Friday showed confidence among large manufacturers, including automakers and technology firms, plunged to the lowest level in almost three years during the final months of 2012.
The survey -- which comes just days after official data showed the economy contracted in the third quarter and may have slipped into recession -- was sure to heap pressure on the BoJ for a stepped-up economic offensive as it heads into a policy meeting next week, dealers said.
Currency markets were also keeping a close eye on talks in Washington on averting the fiscal cliff as concerns grow that divided US lawmakers will not clinch a new spending deal.
Supporting the euro, European finance ministers agreed Thursday to release a 34.3 billion euro ($44.7 billion) installment of aid to debt-stricken Greece, averting a default.
The dollar was mixed against other Asia-Pacific currencies.
It rose to 1,073.75 South Korean won from 1,072.13 won on Thursday, to 54.55 Indian rupees from 54.16 rupees, and to 41.14 Philippine pesos from 41.02 pesos.
The greenback eased to 9,694 Indonesia rupiah from 9,699 rupiah while it was flat at Tw$29.05, at 30.64 Thai baht and Sg$1.2212.
The Australian dollar slipped to US$1.0536 from US$1.0548 while China's yuan bought 13.39 yen against 13.31 yen.