階かい段だん室しつ

noun

stairwell; stair hall; staircase

Refers to the enclosed vertical space containing a staircase, often in apartment buildings or public facilities. Can also mean the room or hall that houses the stairs.

• マンションの階かい段だん室しつは非ひ常じょう時じに使つかわれる。

  The apartment building's stairwell is used in emergencies.

• 階かい段だん室しつの窓まどから光ひかりが差さし込こんでいた。

  Light was coming in through the window of the stair hall.