The 10-year deal pushes Bayern's reported annual earnings through the €200-million mark.
The money will help towards repaying part of the €340 million-debt for the Allianz Arena stadium which they share with second-division side 1860 Munich.
"I am sure that this partnership will open up many new global possibilities for us," said Bayern's chairman Karl-Heinz Rummenigge. "I think it will help in the Asian market where Audi are already very strongly represented and we are looking forward to working closely together."
After German sportswear giants Adidas invested in the Munich club in 2002 for € 77 million, the deal makes Audi Bayern's second main investor.