Lawyer’s analysis The power of attorney needs to be signed by the client. If the authorization for agency is in written form, the power of attorney shall state the name of the agent, matters of agency, authority and term, and shall be signed or sealed by the principal. Therefore, the power of attorney needs to be signed by the principal. Article 163 of the Civil Code: Agency includes entrusted agents and legal agents. The entrusted agent exercises the power of agency in accordance with the principal's entrustment. The legal agent shall exercise the power of agency in accordance with the provisions of the law.