This was said by Prime Minister James Marape, who sent the invitation via Japan's Vice Foreign Affairs Minister, Masatoshi Akimoto who was in Port Moresby for bilateral discussions last week.
During the talks Marape said Japan continued to support PNG and that its support and development cooperation was highly valued.
"Japan has lent much support to us in our development endeavours and the latest being the Lae's Nadzab Tomodachi International Airport, costing well over K770 million," he said.
This amount was lent to PNG at 0.1% interest, said Marape, who added that the airport would enable Morobe Province to lure more tourists and businesses into the country.
The airport will be the gateway for the export of PNG's marine resources and fish such as tuna to Japanese markets.
"We want to open up the Japanese markets for our tuna to be freighted directly to Japan through the Nadzab Tomodachi International Airport once it is ready for use," Marape said.