A journalist asked how Trierweiler was during a joint press conference with Dutch Prime Minister Mark Rutte in The Hague, where Hollande is on his first trip abroad since news of the affair broke.
"I thank you for your question," Hollande said.
"Valerie Trierweiler is doing better and resting at the moment at La Lanterne," he said, referring to the presidential residence in Versailles, outside Paris.
"I don't have any other comment to make," he said.
Concern had been mounting for Trierweiler, 48, after she fell ill following the revelation that Hollande, 59, had been having an affair with 41-year-old actress Julie Gayet.