I paid 1000 yen ($10.64 €8.20) to enter Idemitsu museum which is located near Imperial Place. There is no charge for junior high student or under.
When I visited, the exhibition of Art of Orient was held. The founder Mr. Idemitsu loved Georges Rouault and he collected some of his painting. The museum displays Georges Rouault’s painting periodically.
This is the ticket of Art of Orient.