With two new deputy governors but no chief, the Bank of Japan got down to business under a new regime Friday.

It is the first time in postwar history for the central bank to be without a governor. The absence is due to political wrangling between the ruling and opposition parties.

Masaaki Shirakawa, an executive director of the central bank between 2002 and 2006, and Kiyohiko Nishimura, a member of the BOJ's Policy Board until Wednesday, officially received letters of appointment for the deputy governorship at the Diet in the morning.