also: けいびかいしゃ
noun
security company; security firm
A company that provides security services, such as guarding buildings, patrolling, or monitoring alarm systems.
このビルの警備は、あの警備会社が担当している。
That security company is in charge of security for this building.
警備会社に頼んで、夜
We have hired a security company to do nighttime patrols.