She interrupted Newshub host Ryan Bridge to tell him what was happening at the parliament complex in the capital, Wellington.
"We’re just having a bit of an earthquake here Ryan, quite a decent shake here," she said, looking up and around the room.
"But, um, if you see things moving behind me, the beehive moves a little more than most."
New Zealand sits on the Pacific Ring of Fire and is sometimes called the Shaky Isles for its frequent quakes.
Monday’s magnitude 5.6 quake struck in the ocean about 62 miles northeast of Wellington, according to the US Geological Survey.
The quake hit just before 8am and was felt by thousands of New Zealanders who were getting ready to start their work weeks.
It was strong enough to rattle food from shelves and stop train services, and there were no reports of major damage or injuries.
Ms Ardern continued on with her interview, telling the host the shaking had stopped.
"We’re fine Ryan," she said before adding: "I’m not under any hanging lights, I look like I’m in a structurally sound place."
A 2011 quake in the city of Christchurch killed 185 people and destroyed much of the downtown area. The city is continuing to rebuild.