This museum is great for those interested in the history of Japanese coins. The entrance is a bit hard to find if you rely the GPS direction. Best to look for the main entrance where there are guards.
When you arrive, you will need to sign in and be given a pin. The mint museum is around the corner in a very distinct red building.
Entrance to the museum is free however be wary of what you can and cannot take photo off. There are staff on every floor and this museum always felt like someone is watching you and is quite quiet. The day I came, there was not much tourists.
The souvenir store has very cool collectibles but most of them are on the very pricey end. I found them quite genuine and worth the buy if you want to.
