The House of Representatives of Japan is the Lower house, with the members of the house being elected once every four years, or when dissolved, for a four-year term.As of December 24, 2014, it has 475 members. Of these, 180 members are elected from 11 multi-member constituencies by a party-list system of proportional representation, and 295 are elected from single-member constituencies. 238 seats are required for majority. The House of Representatives is the more powerful house out of the two, it is able to override vetoes on bills imposed by the House of Councillors with a two-thirds majority. It can, however, be dissolved by the Prime Minister at will.Members of the house must be of Japanese nationality; those aged 18 years and older may vote, while those aged 25 years and older may run for office in the lower house.