noun
A person who signs a document, especially in legal or formal contexts. Often used for parties to a contract or agreement.
契約書には加判人の署名が必要です。
The contract requires the signature of the signatory.
Compound of 加 (ka, 'add, join') + 判 (han, 'seal, stamp') + 人 (nin, 'person'), referring to a person who affixes their seal or signature to a document.