Mitsubishi Auto Gallery (三菱オートギャラリー)
Mitsubishi really do have to work harder on marketing their own auto museum. It's as though they don't want the public to know. I've come up with three possible reasons why that might be. One, they don't want to be seen to brag. Two, they feel it's nothing worth shouting about. Or three, they don't like visitors. The place itself is hard to reach with a (Japanese language) reservation a neccessity. Good luck.
15 minute walk from Kitanomasuzuka Station (Aichi Loop Line)