It is judged that this Shibocho was created in the first half of the ninth century, because a year was described as 849 in Document No. 20 (back matter of a letter), and was described as 850 in Document No. 21 (letter), which were unearthed together.
この死亡帳は同時に出土した20号文書（解文の書止部分）に「嘉承二年」（849年）、21号文書（書状）に「嘉祥三年」（850年）の年紀があることから、9世紀前半のものと判断される。