The Democratic Party of Japan-led ruling coalition lost its Upper House majority on Sunday as Prime Minister Naoto Kan's sudden emphasis on tax reform pushed voters back to the Liberal Democratic Party.

Of the 121 seats up for grabs, the DPJ secured 44, compared with 51 for the LDP.

The LDP, which had 38 seats up for contention, emerged as the victor in the election and was set to secure far more than the 71 seats it had going in.