Mitsubishi UFJ Financial Group Inc. named Hironori Kamezawa as chief executive officer on Friday, turning to a math expert to help Japan's biggest bank forge a path in the digital era.

Kamezawa, 58, will take the top post on April 1, the Tokyo-based bank said in a statement the same day, confirming news reports from earlier this week. He succeeds Kanetsugu Mike, 63, who is stepping down after just a year at the helm but will remain chief of the main lending subsidiary.

Currently deputy president and a leader of the lender's technology overhaul, Kamezawa faces the challenge of reshaping a domestic business that's being squeezed by low interest rates and costly branches.