Philippine President Ferdinand Marcos Jr has praised his dictator father's rule after being sworn in as the country's new leader, completing a decades-long effort to restore the clan to the country's highest office.

Ferdinand "Bongbong" Marcos Jr, 64, won last month's elections by a landslide, securing the biggest victory since his father and namesake was ousted by a popular revolt in 1986.

He succeeds the hugely popular Rodrigo Duterte, who gained international infamy for his deadly drug war and has threatened to kill suspected dealers after he leaves office.

Mr Marcos Jr took the oath in a public ceremony at the National Museum in Manila in front of hundreds of local and foreign dignitaries, and journalists and supporters.

With his 92-year-old mother Imelda sitting nearby, Mr Marcos Jr praised the late patriarch's regime, which critics describe as a dark period of human rights abuses and corruption.

"I once knew a man who saw what little had been achieved since independence ... He got it done," Mr Marcos Jr said after being sworn into office, claiming his father built more roads and produced more rice than all of his predecessors combined.

"So will it be with his son. You will get no excuses from me."

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Ahead of the swearing-in, Mr Duterte received Mr Marcos Jr at the Malacanang presidential palace - which the Marcos family fled into exile 36 years ago.

Mr Duterte wore a mask and his traditional formal shirt, characteristically unbuttoned at the top and with sleeves rolled up, for the meeting with Mr Marcos Jr, who he once described as "weak".

The ceremony comes days after the Supreme Court dismissed final attempts to have Mr Marcos Jr disqualified from the election and prevent him taking office.

As rising prices squeeze an economy already ravaged by Covid-19, Mr Marcos Jr has made tackling inflation, boosting growth and ramping up food production his priorities.

He has taken the rare step of appointing himself agriculture secretary to lead the overhaul of the problem-plagued sector.

Mr Marcos Jr has also pledged to defend the Philippines' rights to the disputed South China Sea, which Beijing claims almost entirely.

But he has offered scant detail on how he will achieve his goals and few hints about his leadership style after largely shunning media interviews.

Pro-Duterte commentator Rigoberto Tiglao wrote recently that he was optimistic for an "economic boom" under Mr Marcos Jr.

Mr Tiglao pointed to the "accomplished academicians" on Marcos Jr's economic team and the support of "powerful magnates" who will be able to provide him with advice and financial support.

Mr Marcos Jr, who appears to be more polite and businesslike than Mr Duterte, was swept to power with the help of a massive social media misinformation campaign.

Pro-Marcos groups bombarded Filipinos with fake or misleading posts portraying the family in a positive light while ignoring the brutality and graft of the patriarch's 20-year rule.

Crucial to Mr Marcos Jr's success was an alliance with Mr Duterte's daughter Sara, who secured the vice-presidential post with more votes than him, and the backing of rival dynasties.

Many expect Mr Marcos Jr will be less violent and more predictable than Mr Duterte, but activists and clergy fear he could use his victory to entrench himself in power.

Mr Marcos Jr, who has distanced himself from his father's rule but not criticised it, last month pledged to "always strive to perfection".

He has filled most cabinet positions. But the most influential adviser during his six-year term will likely be his wife, Louise, who claims to have no interest in joining his government but is widely believed to have run his campaign.

Sergio Ortiz-Luis, president of the Employers Confederation of the Philippines, said the country had a "big chance that we can be moving forward and ahead of the pack" under Mr Marcos Jr.

"We are very optimistic on the quality of the leadership that we have now," Mr Ortiz-Luis said.

Unlike Mr Duterte, who pivoted away from the United States towards China, Mr Marcos Jr has indicated he will pursue a more balanced relationship with the two superpowers.

He said last month he would adopt a "friends to all, enemy to none" foreign policy.

But unlike Mr Duterte, he insisted he would uphold an international ruling against Beijing over the resource-rich South China Sea.

While he has backed Mr Duterte's drug war, which has killed thousands of mostly poor men, he is not likely to enforce it as aggressively.

"I think the Philippine political elite are ready to move on from a violence-led drug war," said Greg Wyatt of PSA Philippines Consultancy.

"The drug war attracted enough negative attention."