"Emmanuel is not a patriot. He sold off national companies. He criticised French culture," Florian Philippot, deputy leader of Ms Le Pen's National Front told BFM TV, saying she and Ms Macron held completely different visions of France.
Mr Philippot called the independent centrist and former investment banker 'arrogant' and said that in Sunday night's speech acclaiming his move into the May 7 second round "he was speaking as if he had won already".
"That was disdainful towards the French people", Mr Phillipot said. Mr Macron's victory dinner celebrations at Paris's upscale Rotonde restaurant amounted to "bling-bling biz," he said.
Though Mr Macron, 39, is a comparative political novice who has never held elected office, new opinion polls on Sunday saw him easily winning the final clash against the 48-year-old Ms Le Pen.
Interior ministry final figures in the highly-contested first round gave Mr Macron 23.74 per cent of the votes against Ms Le Pen's 21.53.
A Harris survey saw Mr Macron going on to win the runoff against her by 64 per cent to 36. An Ipsos/Sopra Steria poll gave a similar result.
Analysts say Ms Le Pen's best chance of hauling back Mr Macron's big lead in the polls is to paint him as a part of an elite aloof from ordinary French people and their problems.
Sunday's outcome is a huge defeat for the two centre-right and centre-left groupings that have dominated French politics for sixty years.
It reduces the prospect of an anti-establishment shock on the scale of Britain's vote last June to quit the European Union and the election of Donald Trump as US president.
In a victory speech on Sunday Mr Macron told supporters of his fledgling En Marche! (Onwards!) movement, "In one year, we have changed the face of French politics." He went on to say he would bring in new faces and talent to transform a stale political system if elected.
Conceding defeat even before figures from the count came in, rival conservative and Socialist candidates urged their supporters now to throw their energies into backing Mr Macron and stopping any chance of a second-round victory by Ms Le Pen, whose anti-immigration and anti-Europe policies they said spelled disaster for France.
(Writing by Andrew Callus, Editing by Richard Balmforth)