Work on construction of the building began in April this year following the official handover of the land near the village of Tukao.
Puna attended the event and thanked the landowners for allowing the government to use their land to build the terminal.
The government appropriated $60,000 for the project in the 2016/17 Budget.
Before the new building was constructed Manihiki had no airport terminal. Passengers were forced to check in for flights under the small overhang of a private house during flight days and with family and friends, wait out in the open under the shade of nearby coconut trees for flight arrivals and departures.