Bardal, alongside Maren Lundby, Tom Hilde and Anette Sagen, looked good almost throughout the mixed team competition and were not to be denied a deserved victory.
The Norwegian quartet held a slender lead over Japan after a first round that saw Austria fail to qualify following Andreas Kofler's disqualification for an illegal suit.
Austria were well placed in third after round one but it effected Norway little as they then topped the pile after the next four jumps in the second round in Lillehammer.
They increased their lead from five points to over 18 after Lundby's first jump before Hilde helped to extend it to over 31 before Japan fought back.
The lead was just under eight heading into the final round however Taku Takeuchi failed to nail the perfect jump that would have troubled Norway and Bardal.
As it was Bardal landed his attempt perfectly with Norway finishing with an overall total of 983.1 and Japan having to make do with 966 and second.
Italy, despite Sebastian Colloredo falling on his landing in the last round, completed the podium in third with 899 while Germany were fourth with 875.7.