He says the money could have helped others and promised to regain it.
Over a million people have been evacuated.
A meteorological official said people in affected areas should not hesitate to evacuate their homes.
A third person was been found alive on a life raft on Friday morning.
The 30-year-old Filipino was spotted two kilometres from Kodakara Island in Japan's south.
A second person has been found in the search for a missing livestock carrier, the Japanese Coastguard said on Friday.
Two Kiwis were among those onboard.
"Prime Minister Abe struck me as a person of great integrity."
"I cannot be Prime Minister if I cannot make the best decisions for the people."