private document
Refers to a document created by a private individual or entity, as opposed to an official or public document. Often used in legal, business, or administrative settings.
この契約書は私文書として扱われます。
This contract is treated as a private document.
Forgery of private documents is punishable by law.
He was arrested for forging a private document.
When drawing up private documents such as contracts, it's best to consult an expert.