Democratic Party of Japan President Ichiro Ozawa said Tuesday the DPJ may submit a censure motion against labor minister Yoichi Masuzoe in the Upper House for breaking his pledge to match all 50 million unidentified pension premium payment records with their holders by the end of March.

Ozawa said Prime Minister Yasuo Fukuda was also responsible, but the person directly in charge bears the brunt of the blame.

"Pensions are a very important issue for the lives of the public, and (the government) consequently lied to them," Ozawa said at a news conference. "I believe the minister in charge bears a grave responsibility, and if he doesn't voluntarily apologize and (resign), we will consider" submitting the censure motion.