Images from day 11
Tsonga, 22, will be the third Frenchman to play in the Australian Open final after Jean Borotra in 1928 and Arnaud Clement in 2001.
Cypriot Marcos Baghdatis was the last unseeded player to reach the men's final at Melbourne Park, in 2006.
"It is just amazing, unbelievable, nothing could stop me today," Tsonga said in a courtside interview.
"I tried to hit everything and everything went in, so what can I say?"