The Nikkei 225 Index rose 1.1% to above 54,100 and the broader Topix Index added 0.6% to 3,620 on Wednesday, with both benchmarks pushing to fresh record highs as speculation of a snap election next month fueled expectations of more aggressive fiscal stimulus.
Prime Minister Sanae Takaichi is seen leveraging strong public approval to advance expansionary policies, bolstering the medium term growth outlook.
Investors also weighed private data showing manufacturing activity is losing momentum amid trade frictions, while the services sector faces tourism related headwinds, limiting the Bank of Japan's scope to tighten policy.
Technology stocks led the rally, with Advantest up 2.9%, Discoo Corp gaining 2.8% and Lasertec rising 2.9%.
Other heavyweights including JX Advanced, Fast Retailing and Sony Group also moved higher.

Sumber : Trading Economics