The survey reflected voters' dissatisfaction with the coalition government of the LDP and the New Komeito party.

LDP President and Prime Minister Taro Aso has failed to demonstrate strong leadership as his administration neglected to deal with long-term economic problems and suffered a series of scandals.

The ruling party, which has held power for more than half a century, has failed to address domestic concerns, such as Japan's strained pension system and its ageing, shrinking population.