Atsuo Nakamura, the leader and only member of the Greens Japan party in the House of Councilors, lost his seat in Sunday's election, according to the final results announced Monday by the Central Election Administration Committee.

Nakamura, 64, who ran in the proportional representation segment, garnered 204,712 votes. His party fielded 10 candidates in the section, in which voters write either the name of a party or candidate, but none won.

It is difficult for minor parties to make inroads.