appointer; person with appointive power
Legal/administrative term for the person or entity holding the authority to appoint someone to a position, such as a government official or corporate officer.
The appointer selects a suitable person from among the candidates and appoints them.
The National Public Service Act clearly defines the authority of the appointer.
任命 is the act of appointment; 任命権者 is the person or entity with the authority to appoint.
権限 is authority or power in general; 任命権者 specifically refers to the holder of appointive authority.
Compound of 任命 (appointment) + 権 (authority) + 者 (person). A straightforward Sino-Japanese legal term.