New Zealand First MP Fletcher Tabuteau has been named the new deputy leader of the party after a caucus meeting this morning.
Leader Winston Peters confirmed that Mr Tabuteau - currently serving his second term as an MP - would take over the role from Ron Mark.
Mr Tabuteau said he was "delighted to have received the confidence" of his caucus colleagues.
"There is a lot of work to get on with and I am up to the challenge with a great team of people around me."
Mr Tabuteau has the roles of Parliamentary Under-Secretary to the Minister of Foreign Affairs and to the Minister for Regional Economic Development in the current government.
Mr Tabuteau has been a member of the party since its inception, said Mr Peters.
Mr Peters said NZ First had extended its "immense gratitude" for Mr Mark's service.
"The party recognises Ron is an integral member of the team and we look forward to him playing a key role in the current government in his capacity as Minister of Defence and Minister of Veterans Affairs," he said.