National Party minister Hekia Parata spent $1,400 on a "limo" for two days during an official trip to Sydney.
Parata hired a Holden Caprice with a driver from 13Limo - whose motto is Luxury In Motion - while meeting Australian business leaders in April.
Ministerial credit card details show other Government ministers, including self-described "big spender" Tariana Turia, preferred taxis while on official business in Australia.
The spending was revealed in Parata's card statements, released by Internal Affairs.
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Parata, the Minister of Women's Affairs, said she had eight back-to-back meetings and it was decided hiring a car would be more cost-effective than a taxi.