Kerr batted through the innings and surpassed the 229 not out set by Australia´s Belinda Clark against Denmark in 1997 with a four-four-six sequence from the final three deliveries as New Zealand posted 440 for three.
Kerr is now the second women and seventh overall cricketer to go past the 200-run mark in one-day global cricket.
Before her record breaking score, the Wellington Blaze all-rounder had only managed 174 ODI runs in her fledgling career.
New Zealand's Amelia Kerr on Wednesday shattered Belinda Clark's 21-year-old record for the highest score in women's ODI as she smashed 232 not out in a match against Ireland on Wednesday.
Kerr then completed a remarkable double with a five-wicket bag with figures of 5-17 from seven overs to help the White Ferns complete a three-ODI series sweep of Ireland.
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Kerr's 232 is the third-best in all ODI cricket, after Rohit Sharma's 264 for India against Sri Lanka in 2014 and fellow New Zealander Martin Guptill's 237no against Windies during the 2015 World Cup.
With Sophie Devine rested and captain Suzie Bates dropping down the batting order, Kasperek and, to a lesser extent, Amy Satterthwaite, also cashed in. But the real frenzy began only after Ireland leggie Gaby Lewis - another 17-year-old - dismissed Satterthwaite, making room for Leigh Kasperek to arrive and join forces with Kerr for a partnership with 295 runs off just 199 balls.
In the second ODI, they had posted 418.
"New Zealand, who posted a world record for men and women when they scored 490 for four in the first one-day global, now head to England for a triangular Twenty20 series with the hosts and South Africa".