The outcome of the Dec. 16 election could be ruled unconstitutional by the Supreme Court due to the government's failure to remedy the vote-value disparities, experts warned Friday.

The top court ruled in March last year that disparities of as much as 2.3 to 1.0 in the weight of a vote in the 2009 Lower House election were "in a state of unconstitutionality."

Although the justices called on the Diet to promptly rectify these imbalances, the Dec. 16 poll will be held with the exact same electoral zoning system as in the 2009 election.