An infirmary or nurse's office at a school, workplace, etc., where people with injuries or illness can rest temporarily; often staffed by a nurse.
登校中に気分が悪くなり、保健室で休ませてもらった。
I felt sick on the way to school and rested in the infirmary.
保健室の先生に切り傷の手当をしてもらった。
The nurse in the infirmary treated my cut.
体育の授業で倒れた生徒は保健室に運ばれた。
A student who collapsed during PE was taken to the nurse's office.