Regulations of the Land Registration Article 111

Upon the application for registration of the creation of a mortgage, the written contract and application form shall be affixed with the signature or seal of the debtor if s/he is not the mortgagor.
中文原文 土地登記規則第111條
申請為抵押權設定之登記,其抵押人非債務人時,契約書及登記申請書應經債務人簽名或蓋章。

English translation for reference only; the Chinese text prevails. Not legal advice.