Musashi Kokubunji Temple Remains Museum opened in October, 2009. It is located in the monastery area of Musashi Kokubunji-ato Site, on the east of current Kokubunji Temple, in "Otaka no Michi Yusui-en Park". Here is the residence site of Honda Family who served a headman of Kokubunji Village, and Nagaya-mon Gate and a store house are preserved. In the museum, the archaeological finds from Musashi Kokubunji-ato Site are mainly exhibited based on the concept "to see", "to learn" and "to visit". There is the source of spring water in the museum grounds, too. You can feel a calm atmosphere in the museum.

A lot of pit dwellings were built around Musashi Kokubunji Temple, where people concerned to with the construction and administration of the temple lived. This plate was discovered at one of the remains of pit dwelling, excavated in the Municipal 4th Junior High School located between the monastery and the nunnery. This ceramic plate has a diameter of 15.7 cm and a height of 2.65 cm, wholly coated with an olive green glaze. When looking carefully at the plate, people find that a flower pattern is designed. It is estimated to be produced around Seto City, Aichi Prefecture in the middle of 10th century AD.

The Seed-Syllable of Dainichi Buddha "Vam" is carved at the center of the plated in Sanskrit, and many stamens and eight plates of lotus flower surround it with line engraving. These characteristics shows that this plate would be used as a ritual implement in Buddhist ceremonies.