参さん観かん者しゃ

noun

visitor; observer

Often used for someone visiting a school, factory, or institution to observe, rather than a casual guest.

• 授じゅ業ぎょう参さん観かんの日ひ、多おおくの参さん観かん者しゃが教きょう室しつに来きた。

  On the school open day, many visitors came to the classroom.