New Zealand's latest millionaire is yet to come forward to claim their $22.2 million prize.

The winner of Saturday's Lotto haul bought their ticket in Ashburton.

As of this morning, the prize has yet to be claimed, a Lotto spokeswoman said.

The winning ticket was sold on MyLotto and is made up of $22 million from Powerball first division and $200,000 from Lotto first division.

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It is the biggest Powerball prize this year and the fourth time the game's top prize has been struck so far in 2016.

It is also the biggest win from a ticket purchased online, surpassing a Hokitika family's $15.7 million win in 2013.

The prize jackpotted to $22 million after Wednesday night and it is ranked the seventh-biggest Lotto win in New Zealand.