投とう書しょ箱ばこ

noun

suggestion box; complaints box

A physical box where people can submit written suggestions, complaints, or feedback, often found in public facilities, companies, or schools.

• 市し役やく所しょのロビーに投とう書しょ箱ばこが設せっ置ちされている。

  A suggestion box is installed in the lobby of the city hall.

• お客きゃく様さまのご意い見けんは投とう書しょ箱ばこにお入いれください。

  Please put your feedback in the suggestion box.