Bjoerndalen, 40, beat the previous record he shared with compatriot and cross-country skier Bjorn Daehlie.
Bjoerndalen, who also has 19 world championship titles to his name, started his haul at the Nagano Games in 1998, winning at least two medals at every Olympics since then.
He also won the 10km sprint gold in Sochi.
(Reporting by Julien Pretot; Editing by Peter Rutherford)
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