“It is my intention that I will not hold these parties during my time as prime minister,” Kishida told the committee.
Kishida was the first sitting prime minister to attend such a hearing, which investigates alleged malpractice by lawmakers and was reportedly last held in 2009.
The premier also vowed to revise the political funding law, “in such a way that not only people in charge of accounting but politicians themselves will be held accountable”.
Factions have long been crucial to the inner workings of the LDP – which has governed Japan almost uninterrupted since 1945 – with prime ministers distributing top positions with the politics of these groupings in mind.
Government approval ratings are at their worst level since the LDP returned to power in 2012, dragged down by voter anger about inflation and a string of earlier scandals.
Kishida, in office since October 2021, is due to face a tough internal LDP leadership election battle in late 2024 ahead of national polls due by 2025.