Authorized Personnel Only; No Unauthorized Entry
Fixed phrase used on signs to restrict entry to authorized persons. Common in construction sites, offices, and restricted areas.
This door says 'Authorized Personnel Only'.
There was a sign saying 'No Unauthorized Entry' at the construction site.
A shorter sign meaning 'No Entry' or 'Keep Out', without specifying authorized personnel. 関係者以外立入禁止 explicitly allows authorized persons.
Standard signage form; the most compact and common written variant.
Variant with okurigana り; slightly less compact but still seen on signs.
Compound of 関係者 (authorized person), 以外 (except), 立入 (entry), and 禁止 (prohibited). A set phrase used on signage.