The election committee chief of Japan's ruling Liberal Democratic Party (LDP) resigned on Monday after the party suffered its worst result since 2009, a party official said.

Shinjiro Koizumi, the son of a former prime minister, submitted a letter of resignation, the official said, with media reports quoting him as saying he wanted to "take responsibility" for the result.

Japanese Prime Minister Shigeru Ishiba’s ruling coalition lost a majority in the 465-seat lower house in a snap parliamentary election held on Sunday, a punishment by voters' outrage over the governing party’s extensive financial scandals.

Ishiba's LDP remains the top party in Japan's parliament, and a change of government is not expected. But the results create political uncertainty.

Falling short of a majority makes it difficult for Ishiba to get his party’s policies through parliament, and he may need to find a third coalition partner.

The LDP’s coalition retains a majority in the less powerful upper house.

All told, the ruling coalition with junior partner Komeito secured 215 seats, down sharply from the majority of 279 it previously held, according to Japanese media.

Ishiba took office on October 1 and immediately ordered the election in hopes of shoring up support after his predecessor, Fumio Kishida , failed to address public outrage over the LDP’s scandals.

“The results so far have been extremely severe, and we take them very seriously," Ishiba told Japan's national NHK television late Sunday.

“I believe the voters are telling us to reflect more and become a party that lives up to their expectations."

Ishiba said the LDP would still lead a ruling coalition and tackle key policies, compile a planned supplementary budget and pursue political reform.

He indicated that his party is open to cooperating with opposition groups if that suits the public's expectations.

The Constitutional Democratic Party of Japan, led by centrist leader Yoshihiko Noda, made huge gains to 148 seats, from its previous 98.

“We accomplished our goal of preventing the ruling coalition from a majority, which was a major achievement,” Noda said. (Agencies)