The Ishibashi Foundation maintains a collection of approximately 2,600 works of art.
The origins of this collection lie in the Ishibashi Collection, built up over half a century by Shojiro Ishibashi. Partly through his association with such people as the Western-style artists Hanjiro Sakamoto and Takeji Fujishima, Shojiro became an avid collector of Japanese Western-style paintings. He later broadened his focus to include foreign works of art, amassing a collection that has won acclaim both in Japan and internationally.
In 1961, almost all the works in the Ishibashi Collection were donated to the Ishibashi Foundation, which continues to add to the collection based on deliberations by the Executive Committee of the Museum. The collection currently contains works from a variety of genres, including European painting and Japanese Western-style painting as well as Western and Eastern sculpture and ceramics, and Chinese and Japanese paintings and calligraphic works.