"Hokke Gisho" (Commentary on the Lotus Sutra) of the Sangyo Gisho in Shotoku Taishi's own handwriting is kept as an important property and the oldest existing handwritten document, which is also regarded as an important text in the history of calligraphy.
このうち『法華義疏』は聖徳太子の真筆と伝えられるものが御物となっており、現存する書跡では最も古く、書道史においても重要な筆跡である。