
Martin Dolan, who heads Australia’s search efforts, also said that the operation was continuing “in the right place” in the southern part of the ocean.
The wreckage, said to be a wing part, is to be flown to France for analysis.
The Malaysia Airlines flight – a Boeing 777 travelling from Kuala Lumpur to Beijing – vanished in March 2014.
There were 239 passengers and crew on board when the MH370 went missing.
Aviation experts who have studied photos of the debris said that it resembles a flaperon – a moving part of the wing surface – from a Boeing 777.
“There is no other recorded case of a flaperon being lost from a Boeing 777,” Mr Dolan said.
“We are confident we have the quality of the search to cover that area and find the missing aircraft,” he added.