Fiji's leader Frank Bainimarama said the constitution enshrines principles including an independent judiciary, a secular state, and a range of civil, political, and socio-economic rights. He said it provides a blueprint for the country to move forward.
"On any fair reading, it safeguards the rights of every Fijian and finally lays the basis for the development of a modern, progressive and enlightened state," he said.
Bainimarama plans to contest next year's elections.
Mick Beddoes, a spokesman for the opposition group United Front for a Democratic Fiji, said the constitution was not a document of the people. He and former Prime Minister Mahendra Chaudhry were among those arrested and taken into custody for about two hours during Friday's protests.
Advocacy group Human Rights Watch said provisions in the constitution that grant forgiveness for past abuses and coups will give complete immunity to coup leaders.
"Rarely has a whitewash of past rights abuses been so sweeping and absolute," said Phil Robertson, the group's deputy Asia director, in a statement.
He said Bainimarama's government has consistently attacked its critics and that the military and police have indiscriminately arrested and detained human rights defenders, journalists, and labor leaders.
Neighboring countries including New Zealand and Australia have cautiously welcomed the new constitution. Australia's Foreign Minister Bob Carr said it was a significant development and important step toward Fiji holding elections next year.
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Perry reported from Wellington, New Zealand.