Bardal, who claimed the men's ski jumping World Cup title last season but had never claimed an individual medal at the World Championships or Olympic Games, finally tasted individual success in Italy as his leading leaps in both rounds gave him victory ahead of favourite Gregor Schlierenzauer.
Bardal jumped 103.5m and 100m for a combined points total of 252.6 with Schlierenzauer, the defending individual large hill champion, settling for silver 4.2 behind.
Peter Prevc was another 4.1 adrift to claim bronze and the final podium place ahead of Severin Freund while the winner from Oslo in 2011 Thomas Morgenstern was fifth.
Morgenstern was the first jumper to cross 100m in round one, jumping right on the mark, with Taku Takeuchi quickly following suit to overtake him for the lead with an effort 102m.
That paved the way for more of the same with Freund leaping 101, Richard Freitag 103.5m, Prevc 102.5m and Kamil Stoch of Poland 102m but none were as good as Bardal.
He leapt 103.5m for 124.1 points and the lead with Schlierenzauer, deciding to jump two gates lower to gain compensation points, recording just 98m but a total of 120 points put him third behind Stoch.
Medium intensity snowfall greeted round two with Andreas Wank the early leader until Morgenstern came along with Freund then overtaking them both.
Schlierenzauer saw another request to jump at a lower starting gate this time pay off as he stormed into the lead with a leap of 97.5m for a then best total of 248.4.
However that was to be just bettered by Bardal as good speed gained on the hill allowed him to reach a good height and he landed exactly 100m for 128.5 points and the win.
The 30-year-old had four World Championship medals, all silver and from the team competitions, prior to the individual normal hill final in Val di Fiemme.