Marcos Jr was making a private family visit, spokesman Victor Rodriguez told reporters in Manila.

Australian Prime Minister Scott Morrison telephoned Marcos Jr on Tuesday to congratulate him on his victory in May 9 elections, Rodriguez said.

Rodriguez was critical of the small group of protesters on the sidewalk outside the Melbourne apartment.

"It's embarrassing for Filipinos. It's not a Filipino trait to shame or embarrass his fellow Filipino in another country," Rodriguez said.

"I think the best authority or person to say whether he is welcome or not are the Australian government, and not fellow Filipinos who are there because they are full of hatred and have a very bitter heart," Rodriguez added.

The protesters held signs saying, "Never Again to Fascism and Tyranny" and "Stolen Wealth Yesterday, Stolen Elections Now".

Marcos Jr, the son and namesake of the Philippines' former dictator, arrived in Melbourne on Monday to visit his son Vincent, who is enrolling in a university in Australia's second-most populous city, The Age newspaper reported.

The electoral triumph of Marcos Jr and his allies is a dramatic reversal of the "People Power" revolt in 1986 that forced his father out of office following years of human rights violations and plunder that his son has never acknowledged.

Marcos Jr received more than 31 million votes in the unofficial count in what is projected to be one of the strongest mandates for a Philippine president in decades.

Sara Duterte, his vice presidential running mate and daughter of the outgoing president, appeared to have also won by a large margin.

US President Joe Biden and Chinese President Xi Jinping are among world leaders who have congratulated them.

The separately elected president and vice president are to take office on June 30 for a single six-year term after Congress confirms the results.

Australian Associated Press