Jamie Oliver's Australian restaurant group has fallen into voluntary administration, though the majority of his restaurants will continue to trade under a new owner.

Administrators BDO Australia said Jamie's Italian restaurants in Sydney, Parramatta, Brisbane, Perth and Adelaide will continue to operate under new owner, Brisbane-based Hallmark Group.

Jamie's Italian in Canberra has closed.

Hallmark, the owner of Brisbane Irish bar Finn McCools, bought the restaurants after the Jamie Oliver Restaurant Group went into voluntary administration on Monday.

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The collapse of the celebrity chef's Australian business comes about a year after Oliver bought the restaurants from the receivers of the failed Keystone Group.

It also follows recent media reports that Oliver's restaurants in the UK are in financial strife with debts totalling A$126 million ($133m).