French consumer confidence also climbed to its highest level for a decade according to national statistics agency INSEE.
Its index hit 102 in May, up from 100 in April and the strongest reading since August 2007.
The European Commission’s sentiment data also showed improvements in France across all the sectors it monitors – industry, services, retail, consumer and construction.
Overall the Commission’s economic sentiment indicator is at a six-year high of 107.7, compared with a long-run average score of 100.
“After a slightly higher first quarter, we look for real GDP growth to accelerate to an annualised rate of around 2pc in the rest of 2017, with upside risks to our baseline in the second half of 2017,” said economist Christian Schulz at Citi.
“If our forecast turns out to be right, real GDP growth of 1.5pc would be the highest since 2011.”