After they had sealed three-match ODI series against Bangladesh, New Zealand clinched the three-match T20I series, too.
The hosts won by 28 runs in the second game of the series at Napier in New Zealand on Tuesday.
Chasing 174-run target set by the Kiwis, Bangladesh scored 142 runs, with Liton Das's 51 runs, Mohammad Naim's 38.
Earlier, New Zealand whitewashed visiting Bangladesh 3-0 in ODI.