noun
labor attaché
Official title for a diplomat specializing in labor affairs, typically stationed at an embassy or consulate.
彼は在米日本大使館の労働官として派遣された。
He was dispatched as a labor attaché at the Japanese Embassy in the United States.
外交官 is a general term for diplomat; 労働官 is a specialized diplomatic role focused on labor matters.
Compound of 労働 (labor) and 官 (official, government position). The term follows the pattern of other diplomatic titles such as 経済官 (economic attaché).