The Miki Library, a two-story white pavilion located on the grounds of the registered office of MIKI & CO., LTD. is renowned as one of the finest repositories of historical materials in Tokushima Prefecture. The library is known throughout Japan for its rich collection of materials on the subject of indigo. The exhibition hall consists of three buildings : the Main Hall, the Wasanbon Hall, and the Aratae Hall. A Calligraphy work of Masaji Miki, the 13th Yokichiro, hangs in the stone entranceway of the Main Hall. On the first and second floors, there are numerous exhibits of tools used for indigo dyeing and pounding, ancient accounting ledgers, Joruri-ningyo and other fascinating items.

The materials are primarily heirlooms of the Miki family. In addition to exhibits relating to indigo, they include many important historical documents important to the people of the area. In April 1954, Masaji Miki hating to see these treasures stored in obscurity, opened the collection up to the public as the Miki Library to mark the 280th anniversary of the Company's foundation.

The Miki Library has been widely praised as a resource center for research into Awa indigo and local history by visiting university specialists and teachers. Further, the facility is a frequent destination for university students selecting indigo as the subject for their theses. A guided tour of the building and its collection provides an ideal glimpse at Tokushima's past for clients and business partners visiting the area. The reputation of the Miki Library has resounded beyond the boundaries of Tokushima Prefecture. Of the more than 200 visitors each year, more than half are from elsewhere outside Tokushima Prefecture.

In May 1980, the Miki Library was granted corporation status by the Tokushima Prefecture Board of Education.