has given an explanation."

In the 16-year period up to 2005, a total of 22.8 million yen was registered as rent, 71.6 million yen as personnel costs, 13.5 million yen as utility costs and 15.6 million yen as other miscellaneous costs, according to the funding reports.

"I was not aware that my house had been registered as an office," Akagi's father said. "There has been no staff member on duty and during past election campaigns there were no activities."

If the home was not used as the office, the question becomes what happened to the funds.

Akagi has been elected to the House of Representatives six times since 1990.

The scandal comes as Abe's government and his ruling Liberal Democratic Party faces a tough race in the House of Councilors election.

In the past week, Fumio Kyuma was forced to leave his defense minister's post for comments derided as justifying the U.S. atomic bombings.

In December, administrative reform minister Genichiro Sata resigned from the Cabinet to take responsibility for "inappropriate accounting" of political funds.

Sata admitted one of his political support groups included expenditures by another group on its own books.

In May, farm chief Toshikatsu Matsuoka committed suicide amid a scandal involving his political funds and was replaced by Akagi. Matsuoka booked huge utility fees in his political funding report despite using a rent-free office for Diet members.