But Dr Sean Palmer of Monarchy New Zealand is laughing off the sea change, pointing out that in the figures, people who favour a president appointed by Parliament have been pooled with those who want a directly-elected president "despite the fact that those two groups may not see eye-to- eye on anything."
"They lump them together and declare a great victory," Palmer said.
The question was first asked in March 2014 and showed support starting at 44 per cent. By April 2015 it was up to 47 per cent.
POLL ASKED:
What is your preference for New Zealand's next head of state?
- British monarch 34%
- New Zealand head of State, parliamentary elected 15%
- New Zealand head of State, directly elected 44%
- Unsure/don't know 7%