Jacinda Ardern has left New Zealand's Parliament for the last time, after resigning as prime minister.

Footage showed Ardern waving to a cheering crowd as she left the building, flanked by security.

Ardern hugged and spoke to a number of supporters, thanking people as she went, before giving a final wave and climbing into a car.

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Chris Hipkins has now also been sworn in as New Zealand's 41st prime minister, following Ardern's unexpected resignation.

Hipkins, 44, has promised a back-to-basics approach focusing on the economy and what he described as the "pandemic of inflation."

He will have less than nine months before contesting a tough general election, with opinion polls indicating his Labour Party is trailing its conservative opposition.

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New Zealand Governor-General Cindy Kiro officiated the swearing in ceremony after earlier accepting Ardern's resignation.

Hipkins served as education and police minister under Ardern. He rose to public prominence during the COVID-19 pandemic, when he took on a kind of crisis management role.

But he and other liberals have long been in the shadow of Ardern, who became a global icon of the left and exemplified a new style of leadership.

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