Contractor DCNS beat off competition from Japan and Germany to seal the Aus USD 50 billion (USD 39 billion) deal to design and construct 12 new conventionally-powered subs.
They will be a smaller version of France's 4,700-tonne Barracuda, replacing Australia's ageing diesel and electric-powered Collins Class submarines.
Valls is in the French Pacific territory New Caledonia before travelling to New Zealand today with officials in his delegation confirming that he will detour to Australia tomorrow.
French President Francois Hollande hailed the decision as historic last week.
"It marks a decisive advance in the strategic partnership between the two countries who will cooperate over 50 years," his office said in a statement.
France has a long history of building submarines for export and analysts said it was the most capable contender.
A Japanese government-backed consortium led by Mitsubishi Heavy Industries and German group ThyssenKrupp Marine Systems had also been in the running.
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