Executives of the ruling and opposition parties will meet Wednesday to discuss how to rectify disparities in the weight of votes, following recent court rulings that said some results in December's Lower House election were unconstitutional or invalid, a senior ruling party lawmaker said Sunday.

The ruling Liberal Democratic Party and its coalition partner, New Komeito, will call for the opposition camp's support for a bill to cut the number of single-seat constituencies to 295 from 300 in the House of Representatives during the meeting of party secretaries general, the lawmaker said.

However, the main opposition force, the Democratic Party of Japan, has objected to the ruling parties' plan to reform the electoral system, describing it as "insufficient."