At the beginning of "Tsukumogami-ki," there is a description that states, "According to 'Inyo Zakki,' tools acquired souls and deceived people's hearts 100 years after they were produced. They were called Tsukumogami."
『付喪神記』の冒頭に「陰陽雑記に云ふ。器物百年を経て、化して精霊を得てより、人の心を誑かす、これを付喪神と号すと云へり」とある。