The Nikkei 225 fell 0.4% to below 54,000, while the Topix slipped 0.2% to 3,660, extending losses from the previous session as investors looked ahead to the Bank of Japan's policy meeting next week for any signals on its rate-hike path.
Political uncertainty also weighed on sentiment, with Prime Minister Sanae Takaichi expected to outline plans on Jan. 19 for a possible dissolution of the lower house.
Additionally, the yen strengthened on speculation of potential currency intervention, pressuring Japan's export heavy stocks.
Among major decliners, Tokyo Electron fell 1.6%, Mitsubishi UFJ dropped 1.2%, Sony Group slid 1.6%, Sanrio lost 2.1% and Hitachi declined 2.1%.

Sumber : Trading Economics