Sanae Takaichi, who is expected to become Japan's next prime minister, chose former premier and party heavyweight Taro Aso on Tuesday as vice president of her ruling party, a move some analysts saw as a restraining force against big fiscal spending.

Takaichi also chose former finance minister Shunichi Suzuki as secretary-general of the Liberal Democratic Party (LDP), a job that wields huge influence in party affairs, in a line-up of key party posts announced on Tuesday.

The announcements came after the ruling party's pick of fiscal dove Takaichi as its head on Saturday , putting her on course to become Japan's first female prime minister .

Japan's share prices surged and the yen slumped this week on market expectations Takaichi will deploy big fiscal stimulus and pressure the

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