MP Peseta Sam Lotu-Iiga will quit Parliament at next year's general election.
The politician of Samoan descent will remain the MP for Maungakiekie until the next election to avoid the cost of a by-election.
He will give up his ministerial portfolios - local government, associate health, ethnic affairs and Pacific Peoples - when a new Cabinet is sworn in.
Although first elected in 2008 Mr Lotu-Iiga is in his 10th year of politics at a local and national level.
"I have decided, for a variety of reasons that I should step down from politics at the next election,” he said in a statement.
“I will be exploring new opportunities and I am also looking forward to spending more time with my wife and my young children."
It was tipped that he would not survive Prime Minister Bill English’s reshuffle of the National caucus.
However Mr Lotu-Iiga advised that he had been thinking about it for the last few months.
“I'd consulted with my family, in fact I was asked outside of the caucus room two months ago and said I was still considering it,” he said.
The former corrections minister, who came under fire when allegations of fight clubs in a Serco-run prison surfaced, was demoted in December last year when Judith Collins was reinstated in the Corrections portfolio.
Lotu-Iiga said the job had been "immensely challenging" and it's one that is "taxing on families and your personal relationships".