Prime Minister Yoshihiko Noda has decided to dissolve Japan’s Parliament as early as Friday, with an election possibly next month, media said today, in a move likely to unseat him from power.

Noda will call an election for as early as December 16 or as late as January 20, according to major news media, including the Nikkei business daily and the liberal-leaning Asahi Shimbun .

After months of speculation over the date of the next national ballot, the issue came to the fore yesterday afternoon, with Noda seen pushing a plan to join a vast trans-Pacific free trade deal as one of his core campaign pledges.

That would distinguish his Democratic Party of Japan from the main opposition party, which is largely against the pact.

“Prime minister decides to dissolve Parliament this year,” the front-page headline of the influential Nikkei business daily said today. “The groundwork toward parliamentary dissolution is moving forward.”

The Mainichi Shimbun said the premier could dissolve the lower house on Friday and hold an election on December 9.

Noda declined to discuss when he would call an election when pressed during a parliamentary session.

Political operatives have already shifted to high gear with new smaller parties emerging to tip the traditional balance of power.

Controversial former Tokyo governor Shintaro Ishihara took over an existing conservative party and renamed it “Taiyo no to” — the Party of the Sun, a name that recalls his award-winning 1955 novel “Season of the Sun“.

The media-savvy mayor of Osaka, Toru Hashimoto, has also spent time in the national spotlight again of late, with his “Nippon Ishin no kai” or Japan Restoration Party gaining some traction since its inception in September.

Main opposition Liberal Democratic Party (LDP) leader Shinzo Abe, who served as prime minister for a year to September 2007, is attempting a comeback with a renewed nationalistic agenda.

Polls must be held by next summer when the four-year term of the current parliament expires.

Noda is widely expected to have an uphill battle to get his DPJ re-elected in the face of widespread voter disillusionment with its record in the three years since it ousted the long-ruling LDP.

In the latest Asahi Shimbun poll released today, the approval rating for his Cabinet slipped to mere 18 per cent while the disapproval rating rose to a whopping 64 per cent.

An election defeat would mean Noda, who took office in September 2011, would become the sixth Japanese leader to leave the prime minister’s residence after spending roughly a year in office.

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