The statue of Kongo Zao per se was made in the Edo period but the wooden core goes back to the time that the original statue was created in the Nara period and thus making it scientifically invaluable.
金剛蔵王像自体は江戸時代の作だが、心木は奈良時代創建時のもので、学術的にきわめて貴重なものである。