Chris Tremain, the MP for Napier and Minister for Internal Affairs and Local Government, has decided not to contest the 2014 elections.
Mr Tremain, who made the announcement from Wellington this afternoon, said his family had been a "huge part" of his decision. He said he had made the decision with his my wife and communicated it to the Prime Minister a fortnight ago.
"I have decided to announce it today to allow the National Party time to find a suitable replacement for next year's election."
"I have three children finishing high school and I want to devote more time to them before they leave home," Mr Tremain said.
"I am proud of the significant achievements of this government led by Prime Minister John Key. Under his leadership New Zealand is now one of the strongest growing economies in the western world and has a very bright future. I intend to continue to contribute to this exciting future but now in the commercial sector of our economy."